CVE-2026-41248
Official Clerk JavaScript SDKs: Middleware-based route protection bypass
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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
| CWE | CWE-436 CWE-863 |
| Vendor | clerk |
| Product | astro |
| Published | Apr 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
clerk / astro
>= 0.0.1, < 1.5.7 >= 2.0.0-snapshot.v20241206174604, <= 2.17.9 >= 3.0.0, < 3.0.15
clerk / nextjs
>= 5.0.0, < 5.7.6 >= 6.0.0-snapshot.vb87a27f, < 6.39.2 >= 7.0.0, < 7.2.1
clerk / nuxt
>= 1.1.0, < 1.13.28 >= 2.0.0, < 2.2.2
clerk / shared
>= 2.20.17, < 2.22.1 >= 3.0.0-canary.v20250225091530, < 3.47.4 >= 4.0.0, < 4.8.1