CVE-2026-41248

CRITICAL

Official Clerk JavaScript SDKs: Middleware-based route protection bypass

Title source: cna
STIX 2.1

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)

Core 1
Core References

Scores

CVSS v3 9.1
EPSS 0.0032
EPSS Percentile 23.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-436 CWE-863
Status published
Products (15)
clerk/astro 0.0.1 - 1.5.7npm
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 - 5.7.6npm
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 - 1.13.28npm
clerk/nuxt >= 1.1.0, < 1.13.28
... and 5 more
Published Apr 24, 2026
Tracked Since Apr 24, 2026