CVE-2026-34076 json
Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host
published 2026-03-27 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-17974 , GHSA-gjxx-92w9-8v8f
- cvss
- 7.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 25%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm @clerk/backend 3.2.3
- npm @clerk/express 2.0.7
- npm @clerk/hono 0.1.5
- npm @clerk/fastify 3.1.5
- clerk clerk/hono 0.1.5
- clerk clerk/express 2.0.7
- clerk clerk/backend 3.2.3
- clerk clerk/fastify 3.1.5
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 7 mo ago
Exploit prediction
0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| GitHub | 3.1 | 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @clerk/backend | >=3.0.0, <3.2.3 |
3.2.3 |
| npm | @clerk/express | >=2.0.0, <2.0.7 |
2.0.7 |
| npm | @clerk/hono | >=0.1.0, <0.1.5 |
0.1.5 |
| npm | @clerk/fastify | >=3.1.0, <3.1.5 |
3.1.5 |
Affected products
- clerk javascript
Classification
- Weakness
-
- CWE-918 Server-Side Request Forgery
References
Sources
- CVE List CVE-2026-34076
- GitHub Advisory GHSA-gjxx-92w9-8v8f
- NVD CVE-2026-34076
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.