CVE-2025-53478

CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate via unsanitized i18n messages

State: Published
Severity: 5.4 Medium
Published: Jul 7, 2025
Updated: Jul 7, 2025
Reserved: Jun 30, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Affected Products

Product	Versions
Mediawiki - CheckUser extensionWikimedia Foundation	1.39.x to before 1.39.13Affected 1.42.x to before 1.42.7Affected 1.43.x to before 1.43.2Affected

References

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