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

> CVE-2026-42349: Clerk: Authorization bypass when combining organization, billing, or reverification checks. CVSS 8.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-42349
Last updated: 2026-06-17T10:47:43Z

- Published: 2026-05-11 16:08 UTC · Updated: 2026-06-17 10:47 UTC · Assigner: GitHub\_M
- CVSS: 8.1 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.25%, 16th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-754, CWE-863

## 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.

## 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: vue
- clerk: javascript

## Tracked companies

- [Clerk](https://rewindex.com/company/clerk.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-42349)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-42349)
- [https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3c](https://github.com/clerk/javascript/security/advisories/GHSA-w24r-5266-9c3c)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-42349 · Markdown: https://rewindex.com/cve/CVE-2026-42349.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-42349 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:35.222Z