PT-2025-28943 · Clerk · @Clerk/Backend

Gautiert · Published 2025-07-09 · Updated 2025-07-14 · CVE-2025-53548

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Name of the Vulnerable Software and Affected Versions: @clerk/backend versions prior to 2.4.0

Description: Applications utilizing the verifyWebhook() helper to verify incoming Clerk webhooks are susceptible to accepting improperly signed webhook events.

Recommendations: Upgrade to @clerk/backend version 2.4.0.

Exploit

Fix

Insufficient Verification of Data Authenticity

Weakness Enumeration

CWE-345

Related Identifiers

CVE-2025-53548

GHSA-9MP4-77WG-RWX9

Affected Products

@Clerk/Backend

References · 10

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/53xxx/CVE-2025-53548.json · Exploit
• https://osv.dev/vulnerability/CVE-2025-53548 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-53548 · Security Note
• https://osv.dev/vulnerability/GHSA-9mp4-77wg-rwx9 · Vendor Advisory
• https://github.com/clerk/javascript · Note
• https://github.com/clerk/javascript/security/advisories/GHSA-9mp4-77wg-rwx9 · Note
• https://twitter.com/cracbot/status/1944713564566212626 · Twitter Post
• https://twitter.com/ClerkDev/status/1943023355063603495 · Twitter Post
• https://twitter.com/CVEnew/status/1943335895387516987 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1943018610101829849 · Twitter Post