CVE-2025-53480 – Mediawiki CheckUser Extension Reflected XSS Vulnerability

The following table lists the changes that have been made to the
CVE-2025-53480 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by c4f26cc8-17ff-4c99-b5e2-38fc1793eacc

    Jul. 08, 2025

    Action Type Old Value New Value
    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.

    Added CWE CWE-79
    Added Reference https://gerrit.wikimedia.org/r/q/I777fc55fef15c3b00df0db268af2b64cb2d6e381
    Added Reference https://phabricator.wikimedia.org/T394700
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