Official Clerk JavaScript SDKs: Middleware-based route protection bypass

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Summary

CVECVE-2026-41248
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 21:16:18 UTC
Updated2026-04-24 21:16:18 UTC
DescriptionClerk 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

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from [email protected]

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

Problem Types: CWE-436 | CWE-863 | CWE-436 CWE-436: Interpretation Conflict | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Clerk Astro affected >= 0.0.1, < 1.5.7 Not specified
CNA Clerk Astro affected >= 2.0.0-snapshot.v20241206174604, <= 2.17.9 Not specified
CNA Clerk Astro affected >= 3.0.0, < 3.0.15 Not specified
CNA Clerk Nextjs affected >= 5.0.0, < 5.7.6 Not specified
CNA Clerk Nextjs affected >= 6.0.0-snapshot.vb87a27f, < 6.39.2 Not specified
CNA Clerk Nextjs affected >= 7.0.0, < 7.2.1 Not specified
CNA Clerk Nuxt affected >= 1.1.0, < 1.13.28 Not specified
CNA Clerk Nuxt affected >= 2.0.0, < 2.2.2 Not specified
CNA Clerk Shared affected >= 2.20.17, < 2.22.1 Not specified
CNA Clerk Shared affected >= 3.0.0-canary.v20250225091530, < 3.47.4 Not specified
CNA Clerk Shared affected >= 4.0.0, < 4.8.1 Not specified

References

ReferenceSourceLinkTags
github.com/clerk/javascript/security/advisories/GHSA-vqx2-fgx2-5wq9 [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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