🛡️ CVE-2026-34076
🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-918 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-03-27
Updated 2026-06-02
Modified 2026-04-06
Fix URL N/A

Affected Packages

Software From version Fixed in
@clerk/backend — —
@clerk/express — —
@clerk/fastify — —
@clerk/hono — —
unknown — —

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