Improper Verification of Cryptographic Signature Affecting @clerk/backend package, versions <2.4.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-CLERKBACKEND-10674026
- published10 Jul 2025
- disclosed9 Jul 2025
- creditGautierT
Introduced: 9 Jul 2025
NewCVE-2025-53548 (opens in a new tab)How to fix?
Upgrade @clerk/backend to version 2.4.0 or higher.
Overview
@clerk/backend is a Clerk Backend SDK - REST Client for Backend API & JWT verification utilities
Affected versions of this package are vulnerable to Improper Verification of Cryptographic Signature via the verifyWebhook() function. An attacker can cause unauthorized actions to be accepted by submitting improperly signed webhook events.
Workaround
This vulnerability can be mitigated by manually verifying webhooks as described in the official documentation.