CVE-2026-41248

CRITICAL

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Title source: cna

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

References (1)

[X_Refsource_Confirm] https://github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9

Scores

CVSS v3 9.1

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Details

CWE

CWE-436 CWE-863

Status published

Products (11)

clerk/astro >= 0.0.1, < 1.5.7

clerk/astro >= 2.0.0-snapshot.v20241206174604, <= 2.17.9

clerk/astro >= 3.0.0, < 3.0.15

clerk/nextjs >= 5.0.0, < 5.7.6

clerk/nextjs >= 6.0.0-snapshot.vb87a27f, < 6.39.2

clerk/nextjs >= 7.0.0, < 7.2.1

clerk/nuxt >= 1.1.0, < 1.13.28

clerk/nuxt >= 2.0.0, < 2.2.2

clerk/shared >= 2.20.17, < 2.22.1

clerk/shared >= 3.0.0-canary.v20250225091530, < 3.47.4

... and 1 more

Published Apr 24, 2026

Tracked Since Apr 24, 2026