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Vulnerabilities

Vulnerability · CVE-2026-42349

Clerk JavaScript is the official JavaScript repository for Clerk authentication.

Published May 11, 2026 · catalog updated Jun 17, 2026 · Clerk JavaScript is the

Check if you run it

No confirmed exploitation is on record for CVE-2026-42349. EPSS is 0.43%. Act only if a listed version of Clerk JavaScript is the is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Clerk JavaScript is the).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.6
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Advisory link
Affected products
cpe clerk/clerk/astro · cpe clerk/clerk/backend · cpe clerk/clerk/chrome-extension · cpe clerk/clerk/clerk-expo · cpe clerk/clerk/clerk-js

Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested conditions. This call shape can be bypassed if certain conditions are met: a has() or auth.protect() call that combines a reverification check with any of role, permission, feature, or plan, or that combines a billing check (feature or plan) with a role or permission check. This vulnerability is fixed in @clerk/clerk-js 5.125.10 and 6.7.5.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe clerk/clerk/astroversion unspecified
  • cpe clerk/clerk/backendversion unspecified
  • cpe clerk/clerk/chrome-extensionversion unspecified
  • cpe clerk/clerk/clerk-expoversion unspecified
  • cpe clerk/clerk/clerk-jsversion unspecified

How to fix CVE-2026-42349

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42349. EPSS is 0.43%. Act only if a listed version of Clerk JavaScript is the is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-754; CWE-863: Incorrect Authorization. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 11, 2026 · NIST NVD

    Detected

    Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested c

  2. Jun 17, 2026 · NIST NVD

    Updated

    Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when the result should be false, allowing a gated action to proceed for a user who does not satisfy the full set of requested c

Sources

  • CVE.orgVulnerability recordCVE-2026-42349

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42349

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-42349

    Clerk JavaScript is the official JavaScript repository for Clerk authentication. has(), auth.protect(), and related authorization predicates in @clerk/shared, @clerk/nextjs, @clerk/backend, and other framework SDKs can return true for certain combined authorization checks when th

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.