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CVE-2026-42349: Clerk: Authorization bypass when combining organization, billing, or reverification checks

High · CVSS 8.1 (CVSS 3.1)EPSS 0.25%, 16th percentilePublished Updated Assigner: GitHub_M

Description

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.

Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N · CWE-754, CWE-863

Tracked companies

Clerk

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

@clerk: astro@clerk: backend@clerk: chrome-extension@clerk: clerk-expo@clerk: clerk-react@clerk: expo@clerk: express@clerk: fastify@clerk: hono@clerk: nextjs@clerk: nuxt@clerk: react@clerk: react-router@clerk: shared@clerk: tanstack-react-start@clerk: vueclerk: javascript

References

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