diff --git a/cmd/web_acme.go b/cmd/web_acme.go
index 857114ff902..db23e3acdf5 100644
--- a/cmd/web_acme.go
+++ b/cmd/web_acme.go
@@ -21,8 +21,19 @@ import (
 	"gitea.dev/modules/util"
 
 	"github.com/caddyserver/certmagic"
+	"github.com/mholt/acmez/v3/acme"
 )
 
+func acmeExternalAccountBinding() (*acme.EAB, error) {
+	if setting.AcmeEABKID == "" && setting.AcmeEABHMAC == "" {
+		return nil, nil
+	}
+	if setting.AcmeEABKID == "" || setting.AcmeEABHMAC == "" {
+		return nil, errors.New("both ACME_EAB_KID and ACME_EAB_HMAC must be set")
+	}
+	return &acme.EAB{KeyID: setting.AcmeEABKID, MACKey: setting.AcmeEABHMAC}, nil
+}
+
 func getCARoot(path string) (*x509.CertPool, error) {
 	r, err := os.ReadFile(path)
 	if err != nil {
@@ -66,6 +77,10 @@ func runACME(listenAddr string, m http.Handler) error {
 			log.Warn("Failed to parse CA Root certificate, using default CA trust: %v", err)
 		}
 	}
+	externalAccount, err := acmeExternalAccountBinding()
+	if err != nil {
+		return err
+	}
 	// FIXME: this path is not right, it uses "AppWorkPath" incorrectly, and writes the data into "AppWorkPath/https"
 	// Ideally it should migrate to AppDataPath write to "AppDataPath/https"
 	// And one more thing, no idea why we should set the global default variables here
@@ -84,6 +99,7 @@ func runACME(listenAddr string, m http.Handler) error {
 		Email:                   setting.AcmeEmail,
 		Agreed:                  setting.AcmeTOS,
 		Profile:                 setting.AcmeProfile,
+		ExternalAccount:         externalAccount,
 		DisableHTTPChallenge:    !enableHTTPChallenge,
 		DisableTLSALPNChallenge: !enableTLSALPNChallenge,
 		ListenHost:              setting.HTTPAddr,
@@ -100,7 +116,7 @@ func runACME(listenAddr string, m http.Handler) error {
 	// takes HTTPS down on restart (https://github.com/go-gitea/gitea/issues/38519).
 	// Prefer keeping the existing cert and retrying renewals asynchronously.
 	ctx := graceful.GetManager().ShutdownContext()
-	err := magic.ManageSync(ctx, []string{setting.AppDomain})
+	err = magic.ManageSync(ctx, []string{setting.AppDomain})
 	if err != nil {
 		cert, cacheErr := magic.CacheManagedCertificate(ctx, setting.AppDomain)
 		if cacheErr != nil || cert.Expired() {
diff --git a/cmd/web_acme_test.go b/cmd/web_acme_test.go
new file mode 100644
index 00000000000..bceb15b63ff
--- /dev/null
+++ b/cmd/web_acme_test.go
@@ -0,0 +1,32 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package cmd
+
+import (
+	"testing"
+
+	"gitea.dev/modules/setting"
+	"gitea.dev/modules/test"
+
+	"github.com/mholt/acmez/v3/acme"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAcmeExternalAccountBinding(t *testing.T) {
+	t.Cleanup(test.MockVariableValue(&setting.AcmeEABKID, ""))
+	t.Cleanup(test.MockVariableValue(&setting.AcmeEABHMAC, ""))
+
+	binding, err := acmeExternalAccountBinding()
+	assert.NoError(t, err)
+	assert.Nil(t, binding)
+
+	setting.AcmeEABKID = "kid"
+	_, err = acmeExternalAccountBinding()
+	assert.ErrorContains(t, err, "both ACME_EAB_KID and ACME_EAB_HMAC must be set")
+
+	setting.AcmeEABHMAC = "hmac"
+	binding, err = acmeExternalAccountBinding()
+	assert.NoError(t, err)
+	assert.Equal(t, &acme.EAB{KeyID: "kid", MACKey: "hmac"}, binding)
+}
diff --git a/custom/conf/app.example.ini b/custom/conf/app.example.ini
index 2dcbf66c8d7..ab45e7e9a4a 100644
--- a/custom/conf/app.example.ini
+++ b/custom/conf/app.example.ini
@@ -264,6 +264,11 @@
 ;; ACME profile to request from the CA (e.g. "shortlived" for raw-IP certificates)
 ;ACME_PROFILE =
 ;;
+;; External account binding credentials; set both to enable EAB
+;; ACME_EAB_HMAC should be a base64url-encoded MAC key
+;ACME_EAB_KID =
+;ACME_EAB_HMAC =
+;;
 ;; ACME live directory (not to be confused with ACME directory URL: ACME_URL)
 ;; (Refer to caddy's ACME manager https://github.com/caddyserver/certmagic)
 ;ACME_DIRECTORY = https
diff --git a/go.mod b/go.mod
index 1d5fdd73bd0..7dc4d7118e8 100644
--- a/go.mod
+++ b/go.mod
@@ -68,6 +68,7 @@ require (
 	github.com/mattn/go-isatty v0.0.24
 	github.com/mattn/go-sqlite3 v1.14.52
 	github.com/meilisearch/meilisearch-go v0.36.3
+	github.com/mholt/acmez/v3 v3.1.6
 	github.com/mholt/archives v0.1.5
 	github.com/microcosm-cc/bluemonday v1.0.27
 	github.com/microsoft/go-mssqldb v1.11.2
@@ -199,7 +200,6 @@ require (
 	github.com/markbates/going v1.0.3 // indirect
 	github.com/mattn/go-colorable v0.1.15 // indirect
 	github.com/mattn/go-runewidth v0.0.24 // indirect
-	github.com/mholt/acmez/v3 v3.1.6 // indirect
 	github.com/miekg/dns v1.1.72 // indirect
 	github.com/mikelolasagasti/xz v1.0.1 // indirect
 	github.com/minio/crc64nvme v1.1.1 // indirect
diff --git a/modules/setting/server.go b/modules/setting/server.go
index 289db6a044c..b975f653a61 100644
--- a/modules/setting/server.go
+++ b/modules/setting/server.go
@@ -102,6 +102,8 @@ var (
 	AcmeEmail                  string
 	AcmeURL                    string
 	AcmeProfile                string
+	AcmeEABKID                 string
+	AcmeEABHMAC                string
 	AcmeCARoot                 string
 	SSLMinimumVersion          string
 	SSLMaximumVersion          string
@@ -144,6 +146,11 @@ func loadServerDomainAndURL(sec ConfigSection, protocol string) {
 	AppDomain = appURL.Hostname()
 }
 
+func loadAcmeEABFrom(sec ConfigSection) {
+	AcmeEABKID = sec.Key("ACME_EAB_KID").MustString("")
+	AcmeEABHMAC = sec.Key("ACME_EAB_HMAC").MustString("")
+}
+
 func loadServerFrom(rootCfg ConfigProvider) {
 	sec := rootCfg.Section("server")
 	AppName = rootCfg.Section("").Key("APP_NAME").MustString("Gitea: Git with a cup of tea")
@@ -173,6 +180,7 @@ func loadServerFrom(rootCfg ConfigProvider) {
 		if EnableAcme {
 			AcmeURL = sec.Key("ACME_URL").MustString("")
 			AcmeProfile = sec.Key("ACME_PROFILE").MustString("")
+			loadAcmeEABFrom(sec)
 			AcmeCARoot = sec.Key("ACME_CA_ROOT").MustString("")
 
 			if sec.HasKey("ACME_ACCEPTTOS") {
@@ -208,6 +216,7 @@ func loadServerFrom(rootCfg ConfigProvider) {
 				KeyFile = filepath.Join(CustomPath, KeyFile)
 			}
 		}
+
 		SSLMinimumVersion = sec.Key("SSL_MIN_VERSION").MustString("")
 		SSLMaximumVersion = sec.Key("SSL_MAX_VERSION").MustString("")
 		SSLCurvePreferences = sec.Key("SSL_CURVE_PREFERENCES").Strings(",")
diff --git a/modules/setting/server_test.go b/modules/setting/server_test.go
new file mode 100644
index 00000000000..a855baaddb9
--- /dev/null
+++ b/modules/setting/server_test.go
@@ -0,0 +1,29 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package setting
+
+import (
+	"testing"
+
+	"gitea.dev/modules/test"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestLoadAcmeEABFrom(t *testing.T) {
+	t.Cleanup(test.MockVariableValue(&AcmeEABKID, ""))
+	t.Cleanup(test.MockVariableValue(&AcmeEABHMAC, ""))
+
+	cfg, err := NewConfigProviderFromData(`
+[server]
+ACME_EAB_KID = kid
+ACME_EAB_HMAC = hmac
+`)
+	assert.NoError(t, err)
+
+	loadAcmeEABFrom(cfg.Section("server"))
+
+	assert.Equal(t, "kid", AcmeEABKID)
+	assert.Equal(t, "hmac", AcmeEABHMAC)
+}