CVE-2026-34076

April 1, 2026, 6:16 p.m.

7.4
High

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.

Product(s) Impacted

Vendor Product Versions
Clerk
  • Clerk Hono
  • Clerk Express
  • Clerk Backend
  • Clerk Fastify
  • <0.1.0-0.1.5>
  • <2.0.0-2.0.7>
  • <3.0.0-3.2.3>
  • <3.1.0-3.1.5>

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-918
Server-Side Request Forgery (SSRF)
The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

*CPE(s)

Affected systems and software identified for this CVE.

Type Vendor Product Version Update Edition Language Software Edition Target Software Target Hardware Other Information
a clerk clerk_hono <0.1.0-0.1.5> / / / / / / /
a clerk clerk_express <2.0.0-2.0.7> / / / / / / /
a clerk clerk_backend <3.0.0-3.2.3> / / / / / / /
a clerk clerk_fastify <3.1.0-3.1.5> / / / / / / /

References

https://github.com/clerk/javascript/security/advisories/GHSA-gjxx-92w9-8v8f

Tags

[email protected]
CWE-918
2026-04-01
CVE-2026-34076

CVSS Score

7.4 / 10

CVSS Data - 3.1

  • Attack Vector: NETWORK
  • Attack Complexity: HIGH
  • Privileges Required: NONE
  • Scope: UNCHANGED
  • Confidentiality Impact: HIGH
  • Integrity Impact: HIGH
  • Availability Impact: NONE

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

    View Vector String

Timeline

Published: April 1, 2026, 6:16 p.m.
Last Modified: April 1, 2026, 6:16 p.m.

Status : Received

CVE has been recently published to the CVE List and has been received by the NVD.

More info

Source

[email protected]

*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.