CVE-2022-3907: Clerk < 4.0.0 - Authentication Bypass and API Keys Disclosure

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-12-05 · updated 2026-06-17
Weakness: CWE-203

Description

The Clerk WordPress plugin before 4.0.0 is affected by time-based attacks in the validation function for all API requests due to the usage of comparison operators to verify API keys against the ones stored in the site options.

Affected products

Clerk: before 4.0.0 — fixed in 4.0.0

How to fix

Upgrade to a fixed version: Clerk 4.0.0. Check the vendor advisory for mitigations.

References

https://wpscan.com/vulnerability/7920c1c1-709d-4b1f-ac08-f0a02ddb329c
https://wpscan.com/vulnerability/7920c1c1-709d-4b1f-ac08-f0a02ddb329c

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