JavaScript Vulnerability in Clerk Authentication Affects Multiple Clerk Products
CVE-2026-41248

9.1CRITICAL

Key Information:

Vendor

Clerk

Status
Astro
Nextjs
Nuxt
Shared
Vendor
CVE Published:
24 April 2026

What is CVE-2026-41248?

The Clerk JavaScript library contains a vulnerability where crafted requests can bypass the middleware gating implemented in the @clerk/nextjs, @clerk/nuxt, and @clerk/astro products. This flaw allows unauthorized access to downstream handlers, potentially compromising the security integrity of applications using these libraries. Users are advised to upgrade to the recommended versions to mitigate risks associated with this issue.

Affected Version(s)

astro >= 0.0.1, < 1.5.7 < 0.0.1, 1.5.7

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

astro >= 3.0.0, < 3.0.15 < 3.0.0, 3.0.15

References

https://github.com/clerk/javascript/security/advisories/G...
x_refsource_CONFIRM

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.