What is CVE-2025-53548?

CVE-2025-53548 is a high-severity vulnerability in Clerk Javascript, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2025-07-09.

How severe is CVE-2025-53548?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Clerk Javascript

CVE-2025-53548

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.

EPSS: 0.001 (31.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

Affected products

Clerk Javascript — versions < 2.4.0

Weakness classification (CWE)

CWE-345 — Insufficient Verification of Data Authenticity

References

https://github.com/clerk/javascript/security/advisories/GHSA-9mp4-77wg-rwx9 (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-53548?: CVE-2025-53548 is a high-severity vulnerability in Clerk Javascript, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2025-07-09.
How severe is CVE-2025-53548?: High severity. CVSS v3 base score is 7.5 out of 10.