Clerk vulnerabilities
We track 6 vulnerabilities in Clerk products across 33 products. 6 are rated high or critical, and none are known to be exploited. The most recent was published on May 11, 2026.
Latest Clerk vulnerabilities
- 8.1 High severity
javascript: Improper Check for Unusual or Exceptional Conditions
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 authoriz
- 9.1 Critical severity
astro: Interpretation Conflict
Clerk 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 handle
- 7.4 High severity
javascript: Server-Side Request Forgery
Clerk JavaScript is the official JavaScript repository for Clerk authentication. In @clerk/hono from versions 0.1.0 to before 0.1.5, @clerk/express from versions 2.0.0 to before 2.0.7, @clerk/backend from versions 3.0.0 to before 3.2.3, and @clerk/fastify from
- 7.5 High severity
javascript: Insufficient Verification of Data Authenticity
Clerk helps developers build user management. Applications that use the verifyWebhook() helper to verify incoming Clerk webhooks are susceptible to accepting improperly signed webhook events. The issue was resolved in @clerk/backend 2.4.0.
- 9.8 Critical severity
javascript: Improper Access Control
Clerk helps developers build user management. Unauthorized access or privilege escalation due to a logic flaw in auth() in the App Router or getAuth() in the Pages Router. This vulnerability was patched in version 4.29.3.
- 7.5 High severity
Clerk: Observable Discrepancy
The Clerk WordPress plugin before 4.0.0 is affected by time-based attacks in the validation function for all API requests due to the usage of comparison operators to verify API keys against the ones stored in the site options.