CVE-2026-34076
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.
- CVSS 3.1
- 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N - EPSS
- 0.3% chance of exploitation in the next 30 days; higher than 23% of CVEs (scores of 2026-10-26)
- CWE
- CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-gjxx-92w9-8v8f | npm | @clerk/backend | >=3.0.0 <3.2.3 | 3.2.3 |
| GHSA-gjxx-92w9-8v8f | npm | @clerk/express | >=2.0.0 <2.0.7 | 2.0.7 |
| GHSA-gjxx-92w9-8v8f | npm | @clerk/hono | >=0.1.0 <0.1.5 | 0.1.5 |
| GHSA-gjxx-92w9-8v8f | npm | @clerk/fastify | >=3.1.0 <3.1.5 | 3.1.5 |