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Product · clerk

javascript

4 known vulnerabilities.

All Critical High Medium Low Exploited only Public exploit

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  • High 7.6
    CVE-2026-42349

    Clerk: Authorization bypass when combining organization, billing, or reverification checks

    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 authori…

    clerk javascript astro nuxt Browsers npm
  • High 7.4
    CVE-2026-34076

    Clerk JavaScript: SSRF in the opt-in clerkFrontendApiProxy feature may leak secret keys to unintended host

    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 fro…

    clerk javascript @clerk/express @clerk/backend npm
  • High 7.5
    CVE-2025-53548

    @clerk/backend Performs 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.

    clerk javascript @clerk/nextjs @clerk/astro npm