CVE-2025-53478
Medium
Description
The CheckUser extension’s Special:Investigate interface is vulnerable to reflected XSS due to improper escaping of certain internationalized system messages rendered on the “IPs and User agents” tab. This issue affects Mediawiki - CheckUser extension: from 1.39.X before 1.39.13, from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
SeverityMedium
CVSS5.4
Exploit probability10. percentile0.2%
ProductMediawiki - CheckUser extension
PublishedJul 7, 2025
First seenJul 7, 2025
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- Wikimedia Foundation Mediawiki - CheckUser extension1.39.13, 1.42.7, 1.43.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Wikimedia Foundation Mediawiki - CheckUser extension | 1.39.x ≤ v < 1.39.13, 1.42.x ≤ v < 1.42.7, 1.43.x ≤ v < 1.43.2 | 1.39.13, 1.42.7, 1.43.2 |
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