What’s Vulnerable › Vulnerabilities
CVE-2023-45367
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.7% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2023-10-09 · updated 2026-06-17
Description
An issue was discovered in the CheckUser extension for MediaWiki before 1.35.12, 1.36.x through 1.39.x before 1.39.5, and 1.40.x before 1.40.1. A user can use a rest.php/checkuser/v0/useragent-clienthints/revision/ URL to store an arbitrary number of rows in cu_useragent_clienthints, leading to a denial of service.
Affected products
- Wikimedia Foundation MediaWiki: before 1.35.12; from 1.36.0 before 1.39.5; 1.40.0 — fixed in 1.35.12, 1.39.5
How to fix
Upgrade to a fixed version: Wikimedia Foundation MediaWiki 1.35.12, 1.39.5. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2023-45367 or the next vulnerability affects your stack