CVE-2025-53480

MEDIUM

Mediawiki - CheckUser <1.39.13-1.42.7-1.43.2 - XSS

Title source: llm
STIX 2.1

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.

References (2)

Core 2

Scores

CVSS v3 5.4
EPSS 0.0017
EPSS Percentile 6.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (3)
Wikimedia Foundation/Mediawiki - CheckUser extension 1.39.x - 1.39.13
Wikimedia Foundation/Mediawiki - CheckUser extension 1.42.x - 1.42.7
Wikimedia Foundation/Mediawiki - CheckUser extension 1.43.x - 1.43.2
Published Jul 08, 2025
Tracked Since Feb 18, 2026