CVE-2026-34076: Clerk: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

March 27, 2026

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.

References

github.com/advisories/GHSA-gjxx-92w9-8v8f
github.com/clerk/javascript
github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f
nvd.nist.gov/vuln/detail/CVE-2026-34076

Code Behaviors & Features

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