CVE-2026-42349
8.1 · HIGHOverview
CVE-2026-42349 is a high-severity vulnerability affecting clerk clerk\/astro. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from clerk. Update clerk\/astro to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| clerk | clerk\/astro | >= 2.0.0, < 2.17.11 | Affected |
| clerk | clerk\/backend | >= 2.0.0, < 2.33.3 | Affected |
| clerk | clerk\/chrome-extension | >= 1.3.5, < 2.9.15 | Affected |
| clerk | clerk\/clerk-expo | >= 2.2.11, < 2.19.36 | Affected |
| clerk | clerk\/clerk-js | >= 5.22.0, < 5.125.10 | Affected |
| clerk | clerk\/clerk-react | >= 5.9.0, < 5.61.6 | Affected |
| clerk | clerk\/expo | >= 3.0.0, < 3.2.2 | Affected |
| clerk | clerk\/express | >= 0.1.0, < 1.7.79 | Affected |
| clerk | clerk\/fastify | >= 1.0.42, < 2.6.31 | Affected |
| clerk | clerk\/hono | >= 0.0.2, < 0.1.16 | Affected |
| clerk | clerk\/nextjs | 6.0.0 | Affected |
| clerk | clerk\/nuxt | >= 1.0.0, < 1.13.29 | Affected |
| clerk | clerk\/react | >= 6.0.0, < 6.4.3 | Affected |
| clerk | clerk\/react-router | >= 0.0.1, < 2.4.13 | Affected |
| clerk | clerk\/shared | >= 3.0.0, < 3.47.5 | Affected |
| clerk | clerk\/tanstack-react-start | >= 0.0.1, < 0.29.11 | Affected |
| clerk | clerk\/vue | >= 1.0.0, < 1.17.21 | Affected |
Frequently Asked Questions
What is CVE-2026-42349?
CVE-2026-42349 is a high-severity vulnerability affecting clerk clerk\/astro. It was published on May 11, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-42349?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-42349?
Check the references section for vendor advisories and patches from clerk. Update clerk\/astro to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42349?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42349 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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