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Author SHA1 Message Date
Giteabot
6a27066269 fix(deps): update dependency mermaid to v11.15.0 [security], add e2e test (#37662) 
This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [mermaid](https://redirect.github.com/mermaid-js/mermaid) | [`11.14.0`
→ `11.15.0`](https://renovatebot.com/diffs/npm/mermaid/11.14.0/11.15.0)
|
![age](https://developer.mend.io/api/mc/badges/age/npm/mermaid/11.15.0?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/mermaid/11.14.0/11.15.0?slim=true)
|

---

### Mermaid: Improper sanitization of `classDefs` in diagrams leads to
CSS injection
[CVE-2026-41148](https://nvd.nist.gov/vuln/detail/CVE-2026-41148) /
[GHSA-xcj9-5m2h-648r](https://redirect.github.com/advisories/GHSA-xcj9-5m2h-648r)

<details>
<summary>More information</summary>

#### Details
##### Details

The state diagram and any other diagram type that routes user-controlled
style strings through createCssStyles parser for Mermaid v11.14.0 and
earlier captures `classDef` values with an unrestricted regex:

```jison
// packages/mermaid/src/diagrams/state/parser/stateDiagram.jison:83
<CLASSDEFID>[^\n]*   { this.popState(); return 'CLASSDEF_STYLEOPTS' }
```

The value passes unsanitized through `addStyleClass()` ->
`createCssStyles()` -> `style.innerHTML` (mermaidAPI.ts:418). A `}` in
the value closes the generated CSS selector, and everything after
becomes a new CSS rule on the page.

##### PoC

```
stateDiagram-v2 
      classDef x }*{ background-image: url("http://media.giphy.com/media/SggILpMXO7Xt6/giphy.gif")}
```

Live demo:

<https://mermaid.live/edit#pako:eNpFjzFvgzAQhf-KdVNbEcBgMHhtlkqtOnSJKi8ONsYKBmRMlRTx3-skanvTfbp7996t0IxSAYPZC6_2Rmgn7O4rQ00v5nmvWnRG29OKjqI5aTcug9wZK7RiaHH9A4fO-4kliVXSiFibqbvEzWjvnHxo_fI6vR3e6cGXyX2qTcvhcYMItDMSmHeLisAqZ8UVYeUDQhx8p6ziwEIrhTtx4MNVM4nhcxztrywE0h2wVvRzoGWS_z_8rahBKvcckntgmN5OAFvhDIzUNCZZQXCR5nVaZkUEF2BVFpOcEkoxxhUuyRbB980yjStapKHqoKFlhvPtB7BFZEU>

##### Patches

This has been patched in:

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[e9b0f34d8d82a6260077764ee45e1d7d90957a0f](e9b0f34d8d))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[8fead23c59166b7bab6a39eac81acebee2859102](8fead23c59))

##### Workarounds

Setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will prevent this, by rendering the mermaid diagram in a sandboxed
`<iframe>`.

##### Impact

Enables page defacement, user tracking via `url()` callbacks, and DOM
attribute exfiltration via CSS `:has()` selectors.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r)
-
[8fead23c59)
-
[e9b0f34d8d)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://mermaid.js.org/config/schema-docs/config.html#securitylevel](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
-
[https://github.com/advisories/GHSA-xcj9-5m2h-648r](https://redirect.github.com/advisories/GHSA-xcj9-5m2h-648r)

This data is provided by the [GitHub Advisory
Database](https://redirect.github.com/advisories/GHSA-xcj9-5m2h-648r)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid: Improper sanitization of `classDef` in state diagrams leads
to HTML injection
[CVE-2026-41149](https://nvd.nist.gov/vuln/detail/CVE-2026-41149) /
[GHSA-ghcm-xqfw-q4vr](https://redirect.github.com/advisories/GHSA-ghcm-xqfw-q4vr)

<details>
<summary>More information</summary>

#### Details
##### Impact

Under the default configuration, Mermaid state diagram's `classDef`
allow DOM injection that escapes the SVG, although `<script>` tags are
removed, preventing XSS.

##### Proof-of-concept

```
stateDiagram-v2
  classDef xss fill:red</style></svg><style>*{x:x;y:y;overflow:visible!important;contain:none!important;transform:none!important;filter:none!important;clip-path:none!important}</style><div style="x:x;y:y;color:red;font:5em/1 monospace;display:grid;place-items:center;z-index:2147483647;width:100vw;height:100vh;position:fixed;top:0;left:0;background:black">HACKED</div><svg><style>a:b
  [*] --> A:::xss
```

##### Patches

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[37ff937f1da2e19f882fd1db01235db4d01f4056](37ff937f1d))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[4e2d512bf5bf6f9de1a8f0a48da78dc4d09ac4f3](4e2d512bf5))

##### Workarounds

If you can not update to a patched version, setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will prevent this, by rendering the mermaid diagram in a sandboxed
`<iframe>`.

##### Credits

Thanks to @&#8203;zsxsoft from @&#8203;KeenSecurityLab for reporting
this vulnerability.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr)
-
[37ff937f1d)
-
[4e2d512bf5)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://mermaid.js.org/config/schema-docs/config.html#securitylevel](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
-
[https://github.com/advisories/GHSA-ghcm-xqfw-q4vr](https://redirect.github.com/advisories/GHSA-ghcm-xqfw-q4vr)

This data is provided by the [GitHub Advisory
Database](https://redirect.github.com/advisories/GHSA-ghcm-xqfw-q4vr)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid: Improper sanitization of configuration leads to CSS
injection
[CVE-2026-41159](https://nvd.nist.gov/vuln/detail/CVE-2026-41159) /
[GHSA-87f9-hvmw-gh4p](https://redirect.github.com/advisories/GHSA-87f9-hvmw-gh4p)

<details>
<summary>More information</summary>

#### Details
##### Impact

Mermaid's default configuration allows injecting CSS that applies
outside of the Mermaid diagram via the `fontFamily`, `themeCSS`, and
`altFontFamily` configuration options.

Live demo:
[mermaid.live](https://mermaid.live/edit#pako:eNpNjktLxDAUhf9KvFBR6JS-60QQfODKlUvJ5k6TtsEmKTHFGUP-u-mI6Nmdy3fOPR56wwVQSBIvtXSUeAaD0e4ZlZxPDChhcLxFfwiEauOuLq_9Afv30ZpVczpaITS5kGox1qF2gfSeBwYhJAnThAyz-ewntI68vG5-0z3Z7e7IA9OQwmglB-rsKlJQwircLPgNZeAmocTPAi4GXGfHgOkQYwvqN2PUbzJuGSegA84f0a0LRyeeJI4W_xChubCPcbQD2pwbgHo4Aq2aKmvbqq3zoiu7pizqFE6RybN9VFfFY1HWXRVS-Dr_zLObrt7_V_gGGXZlGg)

Example code:

```
%%{init: {"fontFamily": "x;a{b} :not(&){background:green !important} c{d}"}}%%
flowchart LR
    A --> B
```

The injected CSS exploits stylis's `&` (scope reference) handling.
`:not(&)` escapes the `#mermaid-xxx` automatic scoping, applying styles
to all page elements. Global at-rules (`@font-face`, `@keyframes`,
`@counter-style`) are also injectable as stylis hoists them to top
level.

This allows page defacement and DOM attribute exfiltration via CSS
`:has()` selectors.

##### Patches

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[64769738d5b59211e1decb471ffbaca8afec51aa](64769738d5))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[a9d9f0d8eb790349121508688cd338253fd80d76](a9d9f0d8eb))

##### Workarounds

If you can't upgrade mermaid, you can set the
[`secure`](https://mermaid.js.org/config/schema-docs/config.html#secure)
config value in the mermaid config to avoid allowing diagrams to modify
`fontFamily`, `themeCSS`, `altFontFamily`, and `themeVariables`.

Setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will also prevent this.

##### Credits

Reported by @&#8203;zsxsoft on behalf of @&#8203;KeenSecurityLab

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-87f9-hvmw-gh4p](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-87f9-hvmw-gh4p)
-
[64769738d5)
-
[a9d9f0d8eb)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://github.com/advisories/GHSA-87f9-hvmw-gh4p](https://redirect.github.com/advisories/GHSA-87f9-hvmw-gh4p)

This data is provided by the [GitHub Advisory
Database](https://redirect.github.com/advisories/GHSA-87f9-hvmw-gh4p)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
[CVE-2026-41150](https://nvd.nist.gov/vuln/detail/CVE-2026-41150) /
[GHSA-6m6c-36f7-fhxh](https://redirect.github.com/advisories/GHSA-6m6c-36f7-fhxh)

<details>
<summary>More information</summary>

#### Details
##### Impact

Mermaid v11.14.0 and earlier are vulnerable to a denial-of-service
attack when rendering gantt charts, if they use the [`excludes`
attribute](https://mermaid.js.org/syntax/gantt.html?#excludes) to
exclude all dates.

Example:

```
gantt
  excludes monday,tuesday,wednesday,thursday,friday,saturday,sunday
  DoS :2025-01-01, 1d
```

`mermaid.parse` is unaffected, unless you then call the
`ganttDb.getTasks()` (which is called when rendering a diagram).

##### Patches

This has been patched in:

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[faafb5d49106dd32c367f3882505f2dd625aa30e](faafb5d491))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[a59ea56174712ee5430dfd5bc877cb5151f501a6](a59ea56174))

##### Workarounds

There are no workarounds available without updating to a newer version
of mermaid.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh)
-
[a59ea56174)
-
[faafb5d491)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://github.com/advisories/GHSA-6m6c-36f7-fhxh](https://redirect.github.com/advisories/GHSA-6m6c-36f7-fhxh)

This data is provided by the [GitHub Advisory
Database](https://redirect.github.com/advisories/GHSA-6m6c-36f7-fhxh)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid Gantt Charts are vulnerable to an Infinite Loop DoS
[CVE-2026-41150](https://nvd.nist.gov/vuln/detail/CVE-2026-41150) /
[GHSA-6m6c-36f7-fhxh](https://redirect.github.com/advisories/GHSA-6m6c-36f7-fhxh)

<details>
<summary>More information</summary>

#### Details
##### Impact

Mermaid v11.14.0 and earlier are vulnerable to a denial-of-service
attack when rendering gantt charts, if they use the [`excludes`
attribute](https://mermaid.js.org/syntax/gantt.html?#excludes) to
exclude all dates.

Example:

```
gantt
  excludes monday,tuesday,wednesday,thursday,friday,saturday,sunday
  DoS :2025-01-01, 1d
```

`mermaid.parse` is unaffected, unless you then call the
`ganttDb.getTasks()` (which is called when rendering a diagram).

##### Patches

This has been patched in:

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[faafb5d49106dd32c367f3882505f2dd625aa30e](faafb5d491))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[a59ea56174712ee5430dfd5bc877cb5151f501a6](a59ea56174))

##### Workarounds

There are no workarounds available without updating to a newer version
of mermaid.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-6m6c-36f7-fhxh)
-
[a59ea56174)
-
[faafb5d491)
-
[https://github.com/mermaid-js/mermaid](https://redirect.github.com/mermaid-js/mermaid)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-6m6c-36f7-fhxh) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid: Improper sanitization of configuration leads to CSS
injection
[CVE-2026-41159](https://nvd.nist.gov/vuln/detail/CVE-2026-41159) /
[GHSA-87f9-hvmw-gh4p](https://redirect.github.com/advisories/GHSA-87f9-hvmw-gh4p)

<details>
<summary>More information</summary>

#### Details
##### Impact

Mermaid's default configuration allows injecting CSS that applies
outside of the Mermaid diagram via the `fontFamily`, `themeCSS`, and
`altFontFamily` configuration options.

Live demo:
[mermaid.live](https://mermaid.live/edit#pako:eNpNjktLxDAUhf9KvFBR6JS-60QQfODKlUvJ5k6TtsEmKTHFGUP-u-mI6Nmdy3fOPR56wwVQSBIvtXSUeAaD0e4ZlZxPDChhcLxFfwiEauOuLq_9Afv30ZpVczpaITS5kGox1qF2gfSeBwYhJAnThAyz-ewntI68vG5-0z3Z7e7IA9OQwmglB-rsKlJQwircLPgNZeAmocTPAi4GXGfHgOkQYwvqN2PUbzJuGSegA84f0a0LRyeeJI4W_xChubCPcbQD2pwbgHo4Aq2aKmvbqq3zoiu7pizqFE6RybN9VFfFY1HWXRVS-Dr_zLObrt7_V_gGGXZlGg)

Example code:

```
%%{init: {"fontFamily": "x;a{b} :not(&){background:green !important} c{d}"}}%%
flowchart LR
    A --> B
```

The injected CSS exploits stylis's `&` (scope reference) handling.
`:not(&)` escapes the `#mermaid-xxx` automatic scoping, applying styles
to all page elements. Global at-rules (`@font-face`, `@keyframes`,
`@counter-style`) are also injectable as stylis hoists them to top
level.

This allows page defacement and DOM attribute exfiltration via CSS
`:has()` selectors.

##### Patches

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[64769738d5b59211e1decb471ffbaca8afec51aa](64769738d5))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[a9d9f0d8eb790349121508688cd338253fd80d76](a9d9f0d8eb))

##### Workarounds

If you can't upgrade mermaid, you can set the
[`secure`](https://mermaid.js.org/config/schema-docs/config.html#secure)
config value in the mermaid config to avoid allowing diagrams to modify
`fontFamily`, `themeCSS`, `altFontFamily`, and `themeVariables`.

Setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will also prevent this.

##### Credits

Reported by @&#8203;zsxsoft on behalf of @&#8203;KeenSecurityLab

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-87f9-hvmw-gh4p](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-87f9-hvmw-gh4p)
-
[64769738d5)
-
[a9d9f0d8eb)
-
[https://github.com/mermaid-js/mermaid](https://redirect.github.com/mermaid-js/mermaid)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-87f9-hvmw-gh4p) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid: Improper sanitization of `classDef` in state diagrams leads
to HTML injection
[CVE-2026-41149](https://nvd.nist.gov/vuln/detail/CVE-2026-41149) /
[GHSA-ghcm-xqfw-q4vr](https://redirect.github.com/advisories/GHSA-ghcm-xqfw-q4vr)

<details>
<summary>More information</summary>

#### Details
##### Impact

Under the default configuration, Mermaid state diagram's `classDef`
allow DOM injection that escapes the SVG, although `<script>` tags are
removed, preventing XSS.

##### Proof-of-concept

```
stateDiagram-v2
  classDef xss fill:red</style></svg><style>*{x:x;y:y;overflow:visible!important;contain:none!important;transform:none!important;filter:none!important;clip-path:none!important}</style><div style="x:x;y:y;color:red;font:5em/1 monospace;display:grid;place-items:center;z-index:2147483647;width:100vw;height:100vh;position:fixed;top:0;left:0;background:black">HACKED</div><svg><style>a:b
  [*] --> A:::xss
```

##### Patches

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[37ff937f1da2e19f882fd1db01235db4d01f4056](37ff937f1d))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[4e2d512bf5bf6f9de1a8f0a48da78dc4d09ac4f3](4e2d512bf5))

##### Workarounds

If you can not update to a patched version, setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will prevent this, by rendering the mermaid diagram in a sandboxed
`<iframe>`.

##### Credits

Thanks to @&#8203;zsxsoft from @&#8203;KeenSecurityLab for reporting
this vulnerability.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-ghcm-xqfw-q4vr)
-
[37ff937f1d)
-
[4e2d512bf5)
-
[https://github.com/mermaid-js/mermaid](https://redirect.github.com/mermaid-js/mermaid)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://mermaid.js.org/config/schema-docs/config.html#securitylevel](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-ghcm-xqfw-q4vr) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Mermaid: Improper sanitization of `classDefs` in diagrams leads to
CSS injection
[CVE-2026-41148](https://nvd.nist.gov/vuln/detail/CVE-2026-41148) /
[GHSA-xcj9-5m2h-648r](https://redirect.github.com/advisories/GHSA-xcj9-5m2h-648r)

<details>
<summary>More information</summary>

#### Details
##### Details

The state diagram and any other diagram type that routes user-controlled
style strings through createCssStyles parser for Mermaid v11.14.0 and
earlier captures `classDef` values with an unrestricted regex:

```jison
// packages/mermaid/src/diagrams/state/parser/stateDiagram.jison:83
<CLASSDEFID>[^\n]*   { this.popState(); return 'CLASSDEF_STYLEOPTS' }
```

The value passes unsanitized through `addStyleClass()` ->
`createCssStyles()` -> `style.innerHTML` (mermaidAPI.ts:418). A `}` in
the value closes the generated CSS selector, and everything after
becomes a new CSS rule on the page.

##### PoC

```
stateDiagram-v2 
      classDef x }*{ background-image: url("http://media.giphy.com/media/SggILpMXO7Xt6/giphy.gif")}
```

Live demo:

<https://mermaid.live/edit#pako:eNpFjzFvgzAQhf-KdVNbEcBgMHhtlkqtOnSJKi8ONsYKBmRMlRTx3-skanvTfbp7996t0IxSAYPZC6_2Rmgn7O4rQ00v5nmvWnRG29OKjqI5aTcug9wZK7RiaHH9A4fO-4kliVXSiFibqbvEzWjvnHxo_fI6vR3e6cGXyX2qTcvhcYMItDMSmHeLisAqZ8UVYeUDQhx8p6ziwEIrhTtx4MNVM4nhcxztrywE0h2wVvRzoGWS_z_8rahBKvcckntgmN5OAFvhDIzUNCZZQXCR5nVaZkUEF2BVFpOcEkoxxhUuyRbB980yjStapKHqoKFlhvPtB7BFZEU>

##### Patches

This has been patched in:

-
[v11.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
(see
[e9b0f34d8d82a6260077764ee45e1d7d90957a0f](e9b0f34d8d))
-
[v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
(see
[8fead23c59166b7bab6a39eac81acebee2859102](8fead23c59))

##### Workarounds

Setting [`"securityLevel":
"sandbox"`](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)
will prevent this, by rendering the mermaid diagram in a sandboxed
`<iframe>`.

##### Impact

Enables page defacement, user tracking via `url()` callbacks, and DOM
attribute exfiltration via CSS `:has()` selectors.

#### Severity
- CVSS Score: 5.3 / 10 (Medium)
- Vector String:
`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`

#### References
-
[https://github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r](https://redirect.github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r)
-
[8fead23c59)
-
[e9b0f34d8d)
-
[https://github.com/mermaid-js/mermaid](https://redirect.github.com/mermaid-js/mermaid)
-
[https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)
-
[https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6](https://redirect.github.com/mermaid-js/mermaid/releases/tag/v10.9.6)
-
[https://mermaid.js.org/config/schema-docs/config.html#securitylevel](https://mermaid.js.org/config/schema-docs/config.html#securitylevel)

This data is provided by
[OSV](https://osv.dev/vulnerability/GHSA-xcj9-5m2h-648r) and the [GitHub
Advisory Database](https://redirect.github.com/github/advisory-database)
([CC-BY
4.0](https://redirect.github.com/github/advisory-database/blob/main/LICENSE.md)).
</details>

---

### Release Notes

<details>
<summary>mermaid-js/mermaid (mermaid)</summary>

###
[`v11.15.0`](https://redirect.github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0)

[Compare
Source](https://redirect.github.com/mermaid-js/mermaid/compare/mermaid@11.14.0...mermaid@11.15.0)

##### Minor Changes

-
[#&#8203;7174](https://redirect.github.com/mermaid-js/mermaid/pull/7174)
[`0aca217`](0aca21739c)
Thanks
[@&#8203;milesspencer35](https://redirect.github.com/milesspencer35)! -
feat(sequence): Add support for decimal start and increment values in
the `autonumber` directive

-
[#&#8203;7512](https://redirect.github.com/mermaid-js/mermaid/pull/7512)
[`8e17492`](8e17492f73)
Thanks [@&#8203;aruncveli](https://redirect.github.com/aruncveli)! -
feat(flowchart): add datastore shape

In Data flow diagrams, a datastore/warehouse/file/database is used to
represent data persistence. It is denoted by a rectangle with only top
and bottom borders, and can be used in flowcharts with `A@{ shape:
datastore, label: "Datastore" }`.

-
[#&#8203;6440](https://redirect.github.com/mermaid-js/mermaid/pull/6440)
[`9ad8dde`](9ad8dde6d0)
Thanks [@&#8203;yordis](https://redirect.github.com/yordis),
[@&#8203;lgazo](https://redirect.github.com/lgazo)! - feat: add Event
Modeling diagram

-
[#&#8203;7707](https://redirect.github.com/mermaid-js/mermaid/pull/7707)
[`27db774`](27db774627)
Thanks [@&#8203;txmxthy](https://redirect.github.com/txmxthy)! -
feat(architecture): expose four fcose layout knobs for
`architecture-beta` diagrams (`nodeSeparation`,
`idealEdgeLengthMultiplier`, `edgeElasticity`, `numIter`) so authors can
tune layout density and spread overlapping siblings without changing
diagram source

-
[#&#8203;7604](https://redirect.github.com/mermaid-js/mermaid/pull/7604)
[`bf9502f`](bf9502fb60)
Thanks [@&#8203;M-a-c](https://redirect.github.com/M-a-c)! -
feat(class): add nested namespace support for class diagrams via dot
notation and syntactic nesting

If you have namespaces in class diagrams that use `.`s already and want
to render them without nesting (≤v11.14.0 behaviour), you can use set
`class.hierarchicalNamespaces=false` in your mermaid config:

  ```yaml
  config:
    class:
      hierarchicalNamespaces: false
  ```

-
[#&#8203;7272](https://redirect.github.com/mermaid-js/mermaid/pull/7272)
[`88cdd3d`](88cdd3dc0a)
Thanks [@&#8203;xinbenlv](https://redirect.github.com/xinbenlv)! -
feat(sankey): add outlined label style, configurable
nodeWidth/nodePadding, and custom node colors

##### Patch Changes

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`e9b0f34`](e9b0f34d8d)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix: prevent unbalanced CSS styles in classDefs

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`37ff937`](37ff937f1d)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix: create CSS styles using the CSSOM

  This removes some invalid CSS and normalizes some CSS formatting.

-
[#&#8203;7508](https://redirect.github.com/mermaid-js/mermaid/pull/7508)
[`bfe60cc`](bfe60cc67b)
Thanks [@&#8203;biiab](https://redirect.github.com/biiab)! -
fix(stateDiagram): `end note` now only closes a note when used on a new
line

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`faafb5d`](faafb5d491)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix(gantt): add iteration limit for `excludes` field

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`65f8be2`](65f8be2a42)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix: disallow some CSS at-rules in custom CSS

-
[#&#8203;7726](https://redirect.github.com/mermaid-js/mermaid/pull/7726)
[`1502f32`](1502f32f3c)
Thanks [@&#8203;aloisklink](https://redirect.github.com/aloisklink)! -
fix(wardley): fix unnecessary sanitization of text

-
[#&#8203;7578](https://redirect.github.com/mermaid-js/mermaid/pull/7578)
[`1f98db8`](1f98db8e32)
Thanks [@&#8203;Gaston202](https://redirect.github.com/Gaston202)! -
fix(class): self-referential class multiplicity labels no longer
rendered multiple times

Fixes
[#&#8203;7560](https://redirect.github.com/mermaid-js/mermaid/issues/7560).
Resolves an issue where cardinality labels on self-referential class
relationships were rendered three times due to edge splitting in the
dagre layout. The fix ensures that each sub-edge only carries its
relevant label positions.

-
[#&#8203;7592](https://redirect.github.com/mermaid-js/mermaid/pull/7592)
[`2343e38`](2343e38498)
Thanks [@&#8203;knsv-bot](https://redirect.github.com/knsv-bot)! -
fix(sequence): add background box behind alt/else section title labels
in sequence diagrams

-
[#&#8203;7589](https://redirect.github.com/mermaid-js/mermaid/pull/7589)
[`7fb9509`](7fb9509b8b)
Thanks [@&#8203;NYCU-Chung](https://redirect.github.com/NYCU-Chung)! -
fix(block): prevent column widths from shrinking when mixing different
column spans

-
[#&#8203;7632](https://redirect.github.com/mermaid-js/mermaid/pull/7632)
[`3f9e0f1`](3f9e0f15be)
Thanks [@&#8203;ekiauhce](https://redirect.github.com/ekiauhce)! -
fix(sequence): correct messageAlign label position for right-to-left
arrows in sequence diagrams

-
[#&#8203;7642](https://redirect.github.com/mermaid-js/mermaid/pull/7642)
[`7a8fb85`](7a8fb8532c)
Thanks [@&#8203;tractorjuice](https://redirect.github.com/tractorjuice)!
- fix(wardley): allow hyphens in unquoted component names

Multi-word names containing hyphens — e.g. `real-time processing`,
`end-user`, `on-call engineer` — now parse without quoting, bringing the
grammar in line with the OnlineWardleyMaps (OWM) convention. `A->B`
(no-space arrow) still tokenises correctly.

-
[#&#8203;7523](https://redirect.github.com/mermaid-js/mermaid/pull/7523)
[`5144ed4`](5144ed4b13)
Thanks [@&#8203;darshanr0107](https://redirect.github.com/darshanr0107)!
- fix(block): Arrow blocks in block-beta diagrams not spanning the
specified number of columns when using `:n` syntax.

-
[#&#8203;7262](https://redirect.github.com/mermaid-js/mermaid/pull/7262)
[`13d9bfa`](13d9bfa474)
Thanks [@&#8203;darshanr0107](https://redirect.github.com/darshanr0107)!
- fix(block): Ensure block diagram hexagon blocks respect column
spanning syntax

-
[#&#8203;7684](https://redirect.github.com/mermaid-js/mermaid/pull/7684)
[`e14bb88`](e14bb88bdb)
Thanks [@&#8203;aloisklink](https://redirect.github.com/aloisklink)! -
fix: loosen `uuid` dependency range to allow v14

  Mermaid does not use any of the vulnerable code in CVE-2026-41907,
  but this allows users to silence any `npm audit` alerts on it.

-
[#&#8203;7633](https://redirect.github.com/mermaid-js/mermaid/pull/7633)
[`9217c0d`](9217c0d8b2)
Thanks [@&#8203;Felix-Garci](https://redirect.github.com/Felix-Garci)! -
fix(block): add support for all arrow types in block diagrams

-
[#&#8203;7587](https://redirect.github.com/mermaid-js/mermaid/pull/7587)
[`5e7eb62`](5e7eb62e3a)
Thanks
[@&#8203;MaddyGuthridge](https://redirect.github.com/MaddyGuthridge)! -
chore: drop lodash-es in favour of es-toolkit

-
[#&#8203;7693](https://redirect.github.com/mermaid-js/mermaid/pull/7693)
[`afaf306`](afaf306238)
Thanks [@&#8203;dull-bird](https://redirect.github.com/dull-bird)! -
fix(quadrant-chart): allow CJK, emoji, Latin-1 accented characters, and
other non-ASCII text in unquoted axis/quadrant/point labels.

Previously the lexer only matched ASCII `[A-Za-z]+` for text tokens,
even though the grammar referenced `UNICODE_TEXT`. Bare Chinese,
Japanese, Korean, emoji, and accented Latin characters in labels caused
a parse error. Added a `[^\x00-\x7F]+` lexer rule to emit `UNICODE_TEXT`
and included it in the `alphaNumToken` grammar rule.

Fixes
[#&#8203;7120](https://redirect.github.com/mermaid-js/mermaid/issues/7120).

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`4755553`](4755553d5f)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix: improve D3 types for mermaidAPI funcs

-
[#&#8203;7737](https://redirect.github.com/mermaid-js/mermaid/pull/7737)
[`6476973`](64769738d5)
Thanks
[@&#8203;ashishjain0512](https://redirect.github.com/ashishjain0512)! -
fix: handle `&` when namespacing CSS rules

-
[#&#8203;7520](https://redirect.github.com/mermaid-js/mermaid/pull/7520)
[`8c1a0c1`](8c1a0c1fd1)
Thanks
[@&#8203;RodrigojndSantos](https://redirect.github.com/RodrigojndSantos)!
- fix(stateDiagram): comments starting with one `%` are no longer
treated as comments

  Switch to using two `%%` if you want to write a comment.

- Updated dependencies
\[[`7a8fb85`](7a8fb8532c),
[`675a64c`](675a64ca0e)]:
-
[@&#8203;mermaid-js/parser](https://redirect.github.com/mermaid-js/parser)@&#8203;1.1.1

</details>

---

### Configuration

📅 **Schedule**: (UTC)

- Branch creation
  - ""
- Automerge
  - At any time (no schedule defined)

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

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Renovate](https://redirect.github.com/renovatebot/renovate).

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---------

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Claude (Opus 4.7) <noreply@anthropic.com>
 2026-05-12 01:34:49 +02:00