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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.

PUBLISHED Reserved 2026-03-25 | Published 2026-04-01 | Updated 2026-04-01 | Assigner GitHub_M




HIGH: 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

CWE-918: Server-Side Request Forgery (SSRF)

Product status

@clerk/hono >= 0.1.0, < 0.1.5
affected

@clerk/express >= 2.0.0, < 2.0.7
affected

@clerk/backend >= 3.0.0, < 3.2.3
affected

@clerk/fastify >= 3.1.0, < 3.1.5
affected

References

github.com/...script/security/advisories/GHSA-gjxx-92w9-8v8f

cve.org (CVE-2026-34076)

nvd.nist.gov (CVE-2026-34076)

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