Publish GHSA-gjxx-92w9-8v8f

Author: advisory-database[bot]

advisories/github-reviewed/2026/03/GHSA-gjxx-92w9-8v8f/GHSA-gjxx-92w9-8v8f.json

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+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-gjxx-92w9-8v8f",
+  "modified": "2026-03-27T19:58:19Z",
+  "published": "2026-03-27T19:58:19Z",
+  "aliases": [
+    "CVE-2026-34076"
+  ],
+  "summary": "Clerk: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host",
+  "details": "## Summary\n\nThe `clerkFrontendApiProxy` function in `@clerk/backend` is vulnerable to Server-Side Request Forgery (SSRF). An unauthenticated attacker can craft a request path that causes the proxy to send the application's `Clerk-Secret-Key` to an attacker-controlled server.\n\n## Affected packages\n\nOnly applications that have opted into the `frontendApiProxy` feature are affected. This feature is not enabled by default. **Users of `@clerk/nextjs` are not affected** due to how the framework handles repeated `/` in request paths.\n\n| Package | Affected versions | Fixed version |\n|---|---|---|\n| `@clerk/backend` | `>= 3.0.0, <= 3.2.2` | `3.2.3` |\n| `@clerk/express` | `>= 2.0.0, <= 2.0.6` | `2.0.7` |\n| `@clerk/hono` | `>= 0.1.0, <= 0.1.4` | `0.1.5` |\n| `@clerk/fastify` | `>= 3.1.0, <= 3.1.4` | `3.1.5` |\n\nSearch your codebase for the `frontendApiProxy` option. If none of the patterns below appear in your code, you are not affected.\n\n**@clerk/express**\n```ts\napp.use(clerkMiddleware({ frontendApiProxy: { enabled: true } }));\n```\n\n**@clerk/hono**\n```ts\napp.use('*', clerkMiddleware({ frontendApiProxy: { enabled: true } }));\n```\n\n**@clerk/fastify**\n```ts\nfastify.register(clerkPlugin, { frontendApiProxy: { enabled: true } });\n```\n\n**@clerk/backend**\n```ts\nimport { clerkFrontendApiProxy } from '@clerk/backend/proxy';\n```\n\nA quick way to check across your entire project:\n\n```sh\ngrep -r \"frontendApiProxy\\|clerkFrontendApiProxy\" .\n```\n\nIf there are no matches, you are not using this feature.\n\n\n## Recommended actions\n\nClerk's internal logs show no evidence of users utilizing the built-in proxy with the impacted versions. Despite that, if you are on an impacted version and use the built-in proxy we recommend upgrading and rotating your Clerk Secret Key immediately.\n\n1. **Upgrade** to the patched version of `@clerk/backend` (and `@clerk/express`, `@clerk/hono`, etc.)\n2. **Rotate your Clerk Secret Key** after upgrading - if an attacker exploited this vulnerability, they may have captured your key. Rotate it in the [Clerk Dashboard](https://dashboard.clerk.com) under **API Keys**.  You should deploy your application with the updated key before revoking the existing key.\n3. **Audit access logs** for requests to your proxy endpoint (`/__clerk/` by default) containing double slashes in the path.\n\n\n\n## Credit\n\nDiscovered during an internal code audit.",
+  "severity": [
+    {
+      "type": "CVSS_V3",
+      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@clerk/backend"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "3.0.0"
+            },
+            {
+              "fixed": "3.2.3"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 3.2.2"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@clerk/express"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "2.0.0"
+            },
+            {
+              "fixed": "2.0.7"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 2.0.6"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@clerk/hono"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0.1.0"
+            },
+            {
+              "fixed": "0.1.5"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 0.1.4"
+      }
+    },
+    {
+      "package": {
+        "ecosystem": "npm",
+        "name": "@clerk/fastify"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "3.1.0"
+            },
+            {
+              "fixed": "3.1.5"
+            }
+          ]
+        }
+      ],
+      "database_specific": {
+        "last_known_affected_version_range": "<= 3.1.4"
+      }
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/clerk/javascript"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-918"
+    ],
+    "severity": "HIGH",
+    "github_reviewed": true,
+    "github_reviewed_at": "2026-03-27T19:58:19Z",
+    "nvd_published_at": null
+  }
+}