medium5.4
CVE-2025-53479
The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message.
Impact
The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escaping, making it possible to inject JavaScript through the uselang=x-xss language override mechanism. This issue affects Mediawiki - CheckUser extension: from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Affected products
| Product | Affected versions |
|---|---|
| Mediawiki - CheckUser Extension: From 1.42.X | before 1.42.7 |
| From 1.43.X | before 1.43.2. |
Versions were read from the advisory text. No structured product data has been published for this record yet.