The CheckUser extension’s Special:Investigate page has a vulnerability in the Account information tab, where specific internationalized messages are rendered without proper escaping. Attackers can exploit this by appending ?uselang=x-xss to the URL, causing reflected XSS when the UI renders affected message keys. 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.
History

Tue, 08 Jul 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 08 Jul 2025 15:15:00 +0000

Type Values Removed Values Added
Description The CheckUser extension’s Special:Investigate page has a vulnerability in the Account information tab, where specific internationalized messages are rendered without proper escaping. Attackers can exploit this by appending ?uselang=x-xss to the URL, causing reflected XSS when the UI renders affected message keys. 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.
Title CheckUser: Reflected Cross-Site Scripting (XSS) in Special:Investigate (Account information tab) via unsanitized i18n messages
Weaknesses CWE-79
References

cve-icon MITRE

Status: PUBLISHED

Assigner: wikimedia-foundation

Published: 2025-07-08T14:58:37.544Z

Updated: 2025-07-08T20:44:54.968Z

Reserved: 2025-06-30T15:20:44.461Z

Link: CVE-2025-53480

cve-icon Vulnrichment

Updated: 2025-07-08T20:44:50.742Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2025-07-08T15:15:29.720

Modified: 2025-07-08T21:15:28.227

Link: CVE-2025-53480

cve-icon Redhat

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