diff --git a/routers/api/v1/repo/mirror.go b/routers/api/v1/repo/mirror.go
index ac2d8bba06a..bdca030b765 100644
--- a/routers/api/v1/repo/mirror.go
+++ b/routers/api/v1/repo/mirror.go
@@ -6,6 +6,7 @@ package repo
 import (
 	"errors"
 	"net/http"
+	"strings"
 	"time"
 
 	"code.gitea.io/gitea/models/db"
@@ -101,6 +102,8 @@ func PushMirrorSync(ctx *context.APIContext) {
 	//     "$ref": "#/responses/forbidden"
 	//   "404":
 	//     "$ref": "#/responses/notFound"
+	//   "422":
+	//     "$ref": "#/responses/validationError"
 
 	if !setting.Mirror.Enabled {
 		ctx.APIError(http.StatusBadRequest, "Mirror feature is disabled")
@@ -112,14 +115,18 @@ func PushMirrorSync(ctx *context.APIContext) {
 		ctx.APIError(http.StatusNotFound, err)
 		return
 	}
+
+	failedPushMirrors := make([]string, 0)
 	for _, mirror := range pushMirrors {
 		ok := mirror_service.SyncPushMirror(ctx, mirror.ID)
 		if !ok {
-			ctx.APIErrorInternal(errors.New("error occurred when syncing push mirror " + mirror.RemoteName))
-			return
+			failedPushMirrors = append(failedPushMirrors, mirror.RemoteName)
 		}
 	}
-
+	if len(failedPushMirrors) != 0 {
+		ctx.APIError(http.StatusUnprocessableEntity, "error occurred when syncing push mirrors: "+strings.Join(failedPushMirrors, ", "))
+		return
+	}
 	ctx.Status(http.StatusOK)
 }
 
diff --git a/routers/api/v1/repo/mirror_test.go b/routers/api/v1/repo/mirror_test.go
new file mode 100644
index 00000000000..6cbed49d899
--- /dev/null
+++ b/routers/api/v1/repo/mirror_test.go
@@ -0,0 +1,40 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package repo
+
+import (
+	"net/http"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unittest"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/test"
+	"code.gitea.io/gitea/services/contexttest"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// TestPushMirrorSync verifies the endpoint attempts every push mirror instead
+// of aborting on the first failure, reporting all failed remotes with a 422.
+// Each remote name is not a configured git remote, so SyncPushMirror fails fast
+// without any network access.
+func TestPushMirrorSync(t *testing.T) {
+	unittest.PrepareTestEnv(t)
+	defer test.MockVariableValue(&setting.Mirror.Enabled, true)()
+
+	for _, remoteName := range []string{"broken_remote_1", "broken_remote_2"} {
+		assert.NoError(t, db.Insert(t.Context(), &repo_model.PushMirror{RepoID: 1, RemoteName: remoteName}))
+	}
+
+	ctx, resp := contexttest.MockAPIContext(t, "user2/repo1")
+	contexttest.LoadRepo(t, ctx, 1)
+
+	PushMirrorSync(ctx)
+
+	assert.Equal(t, http.StatusUnprocessableEntity, ctx.Resp.WrittenStatus())
+	assert.Contains(t, resp.Body.String(), "broken_remote_1")
+	assert.Contains(t, resp.Body.String(), "broken_remote_2")
+}
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 312eb25fd8d..d95699a48d6 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -15646,6 +15646,9 @@
           },
           "404": {
             "$ref": "#/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/responses/validationError"
           }
         }
       }
diff --git a/templates/swagger/v1_openapi3_json.tmpl b/templates/swagger/v1_openapi3_json.tmpl
index 04b8bd2d622..642154c5538 100644
--- a/templates/swagger/v1_openapi3_json.tmpl
+++ b/templates/swagger/v1_openapi3_json.tmpl
@@ -27446,6 +27446,9 @@
           },
           "404": {
             "$ref": "#/components/responses/notFound"
+          },
+          "422": {
+            "$ref": "#/components/responses/validationError"
           }
         },
         "summary": "Sync all push mirrored repository",