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

Affected: clerk javascript, @clerk shared, @clerk backend, @clerk nextjs, @clerk clerk-react, @clerk react, @clerk vue, @clerk astro, @clerk nuxt, @clerk clerk-expo and 7 more

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.

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