CVE-2025-53548: Clerk JavaScript

High severity, CVSS 7.5. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Clerk JavaScript: before 2.4.0 (fixed in 2.4.0)

Published 2025-07-09. Last modified 2026-06-17.