CVE-2025-53479

Published Jul 8, 2025

Last updated 8 days ago

CVSS medium 5.4

Overview

Description
The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escaping, making it possible to inject JavaScript through the uselang=x-xss language override mechanism. This issue affects Mediawiki - CheckUser extension: from 1.42.X before 1.42.7, from 1.43.X before 1.43.2.
Source
c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
NVD status
Awaiting Analysis

Risk scores

CVSS 3.1

Type
Secondary
Base score
5.4
Impact score
2.7
Exploitability score
2.3
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Severity
MEDIUM

Weaknesses

c4f26cc8-17ff-4c99-b5e2-38fc1793eacc
CWE-79

Social media

Hype score
Not currently trending

  1. CVE-2025-53479 The CheckUser extension’s Special:CheckUser interface is vulnerable to reflected XSS via the rev-deleted-user message. This message is rendered without proper escapin… https://t.co/WF1ndP6vs2

    @CVEnew

    8 Jul 2025

    426 Impressions

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References

Sources include official advisories and independent security research.