# CVE-2026-41248: Official Clerk JavaScript SDKs:  Middleware-based route protection bypass

> CVE-2026-41248: Official Clerk JavaScript SDKs: Middleware-based route protection bypass. CVSS 9.1 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-41248
Last updated: 2026-06-17T10:46:23Z

- Published: 2026-04-24 21:04 UTC · Updated: 2026-06-17 10:46 UTC · Assigner: GitHub\_M
- CVSS: 9.1 (CVSS 3.1) · Severity: Critical · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS: 0.32%, 25th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-436, CWE-863

## Description

Clerk JavaScript is the official JavaScript repository for Clerk authentication. createRouteMatcher in @clerk/nextjs, @clerk/nuxt, and @clerk/astro can be bypassed by certain crafted requests, allowing them to skip middleware gating and reach downstream handlers. This vulnerability is fixed in @clerk/astro 1.5.7, 2.17.10, and 3.0.15; @clerk/nextjs 5.7.6, 6.39.2, and 7.2.1; @clerk/nuxt 1.13.28 and 2.2.2; and @clerk/shared 2.22.1, 3.47.4, anc 4.8.1

## Affected vendors and products

- clerk: astro
- clerk: nextjs
- clerk: nuxt
- clerk: shared

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-41248)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-41248)
- [https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9](https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9)

---

_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/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-41248 · Markdown: https://rewindex.com/cve/CVE-2026-41248.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-41248 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:29.914Z