CVE-2026-34076 Details
Description
Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from versions 3.1.0 to before 3.1.5, the 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. This issue has been patched in @clerk/hono version 0.1.5, @clerk/express version 2.0.7, @clerk/backend version 3.2.3, and @clerk/fastify version 3.1.5.
A Server-Side Request Forgery (SSRF) vulnerability has been identified in the Clerk JavaScript authentication library. This issue affects the '@clerk/hono' package (versions 0.1.0 prior to 0.1.5), '@clerk/express' (versions 2.0.0 prior to 2.0.7), '@clerk/backend' (versions 3.0.0 prior to 3.2.3), and '@clerk/fastify' (versions 3.1.0 prior to 3.1.5). The vulnerability arises in the 'clerkFrontendApiProxy' function within the '@clerk/backend' package, where an unauthenticated attacker can manipulate request paths to have the proxy send the application's 'Clerk-Secret-Key' to a server controlled by the attacker. This vulnerability is only present in applications that have opted into the 'frontendApiProxy' feature, which is not enabled by default.
Users should upgrade to '@clerk/hono' version 0.1.5, '@clerk/express' version 2.0.7, '@clerk/backend' version 3.2.3, and '@clerk/fastify' version 3.1.5. After upgrading, it is recommended to rotate the Clerk Secret Key via the Clerk Dashboard under API Keys, and to audit access logs for requests to the proxy endpoint that contain double slashes in the path.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 1, 2026CISA-ADP
Assessed Apr 1, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| @clerk/backend | All versions |
CPE
Remediation
| |
| @clerk/express | All versions |
CPE
Remediation
| |
| @clerk/hono | All versions |
CPE
Remediation
| |
| @clerk/fastify | All versions |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 1, 2026 | New CVE Received | [email protected] |