CVE-2025-53480 - CVE House

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Status published Unknown CVE-2025-53480

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

0 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from Wikimedia Foundation

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Affected Vendor

Wikimedia Foundation

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Affected Software

Mediawiki - CheckUser extension

Vulnerable Versions:

1.39.x, 1.42.x, 1.43.x

Timeline

Official Publish: July 8th, 2025

Last Modified: July 8th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1189 Drive-by Compromise

T1059.007 JavaScript

T1539 Steal Web Session Cookie

T1213 Data from Information Repositories

T1567 Exfiltration Over Web Service

T1491.001 Defacement