CVE-2025-53480

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Wikimedia FoundationMediawiki - CheckUser extension1.39.x < 1.39.13affected
Wikimedia FoundationMediawiki - CheckUser extension1.42.x < 1.42.7affected
Wikimedia FoundationMediawiki - CheckUser extension1.43.x < 1.43.2affected

Weaknesses

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

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References