Vulnerability · CVE-2026-42349
Clerk JavaScript is the official JavaScript repository for Clerk authentication.
Published May 11, 2026 · corrected/updated Jun 17, 2026 · clerk clerk/astro · evidence confidence high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-42349 is a high public vulnerability record for clerk clerk/astro. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether clerk clerk/astro is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: clerk/clerk/astro; clerk/clerk/backend; clerk/clerk/chrome-extension; clerk/clerk/clerk-expo. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 7.6, EPSS 0.4%. It is not currently listed in the CISA Known Exploited catalog. Weakness classes: CWE-754, CWE-863. Sources contributing to this record: cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
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
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
Affected
- 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
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