CVE-2025-53479
Description
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.
CWE
- CWE-79 — CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Affected
- Wikimedia Foundation / Mediawiki - CheckUser extension — v=1.42.x <1.42.7 [affected]; v=1.43.x <1.43.2 [affected]
CVSS
- (none)
References
- https://phabricator.wikimedia.org/T394693
- https://gerrit.wikimedia.org/r/q/I159e14543912cb3bc7f4a00c3090c0285b154786
Source
cvelistV5-main/cves/2025/53xxx/CVE-2025-53479.json