CVE-2026-41248CWE-436CWE-863

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Critical · published April 24, 2026

CVSS v3.1
9.1
EPSS
1%
Percentile
43.9
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
9.1 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00529 · 43.9th percentile
Weaknesses
CWE-436 · Interpretation Conflict; CWE-863 · Incorrect Authorization
Published
2026-04-24T21:04Z
EPSS history
Timeline
  • 24 APR 21:04Z
    Official Clerk JavaScript SDKs: Middleware-based route protection bypass
    cvelistv5