{"id":"CVE-2026-34076","aliases":["GHSA-gjxx-92w9-8v8f"],"url":"https://o3.security/vulnerability/CVE-2026-34076","summary":"Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host","details":"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":"2026-04-01T16:59:21.828Z","modified":"2026-08-07T11:31:12.596246352Z","cvss":{"score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@clerk/backend","fixedVersion":"3.2.3"},{"ecosystem":"npm","name":"@clerk/express","fixedVersion":"2.0.7"},{"ecosystem":"npm","name":"@clerk/hono","fixedVersion":"0.1.5"},{"ecosystem":"npm","name":"@clerk/fastify","fixedVersion":"3.1.5"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34076.json"},{"type":"ADVISORY","url":"https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-34076"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T11:31:12.596246352Z"}}