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CVE-2026-42349

7.6 high SSVC exploitation: poc Analyzed
NVD · CVE.org

Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.

Fix

Patch, vendor advisory and mitigation references on NVD 2

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.6 · clerkNVD modified 2026-10-26 18:10

Affected (CPE criteria) 17

  • cpe:2.3:a:clerk:clerk\/astro:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/backend:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/chrome-extension:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/clerk-expo:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/clerk-js:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/clerk-react:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/expo:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/express:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/fastify:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/hono:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/nextjs:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/nuxt:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/react:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/react-router:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/shared:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/tanstack-react-start:*:*:*:*:*:node.js:*:*
  • cpe:2.3:a:clerk:clerk\/vue:*:*:*:*:*:node.js:*:*

References 2