CVE-2025-53548
Published:July 09, 2025
Updated:May 16, 2026
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 Packages
@clerk/fastify (NPM):
Affected version(s) >=2.3.0 <2.4.4Fix Suggestion:
Update to version 2.4.4@clerk/astro (NPM):
Affected version(s) >=2.9.0 <2.10.2Fix Suggestion:
Update to version 2.10.2@clerk/express (NPM):
Affected version(s) >=1.6.0 <1.7.4Fix Suggestion:
Update to version 1.7.4@clerk/tanstack-react-start (NPM):
Affected version(s) >=0.16.0 <0.18.3Fix Suggestion:
Update to version 0.18.3@clerk/nextjs (NPM):
Affected version(s) >=6.3.0-snapshot.v6db56a78ff8bd026e58d6be41383e109862d0e9d <6.23.3Fix Suggestion:
Update to version 6.23.3@clerk/backend (NPM):
Affected version(s) >=2.0.0 <2.4.0Fix Suggestion:
Update to version 2.4.0@clerk/react-router (NPM):
Affected version(s) >=1.5.0 <1.6.4Fix Suggestion:
Update to version 1.6.4@clerk/backend (NPM):
Affected version(s) >=2.0.0 <2.4.0Fix Suggestion:
Update to version 2.4.0@clerk/nuxt (NPM):
Affected version(s) >=1.7.0 <1.7.5Fix Suggestion:
Update to version 1.7.5@clerk/remix (NPM):
Affected version(s) >=4.8.0 <4.8.5Fix Suggestion:
Update to version 4.8.5Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
EPSS
Base Score:
0.13