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

> CVE-2026-34076: Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host. CVSS 7.4 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-34076
Last updated: 2026-06-17T10:38:31Z

- Published: 2026-04-01 16:59 UTC · Updated: 2026-06-17 10:38 UTC · Assigner: GitHub\_M
- CVSS: 7.4 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.31%, 23th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-918

## 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.

## Affected vendors and products

- clerk: javascript

## Tracked companies

- [Clerk](https://rewindex.com/company/clerk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-34076)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-34076)
- [https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f](https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-34076 · Markdown: https://rewindex.com/cve/CVE-2026-34076.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-34076 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:09:46.390Z