CVE-2025-53479

mediumpriority · track · 0EPSS 0.002 · 10 %ileDEEU

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.20% (10th) EPSS

CVSS 5.4 · medium

Is it mine?

10 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · cert_bund

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

5.4

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondary · ENISA EU

v3.15.4mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:Nsecondaryexploitability 2.3 · impact 2.7

v3.15mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-79US

affected products (10)

Products and version ranges known to be affected.

Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
Open Source MediaWiki <1.39.13all versionscert_bundDE
Open Source MediaWiki <1.42.7all versionscert_bundDE
Open Source MediaWiki <1.43.2all versionscert_bundDE
Open Source MediaWiki< 1.39.13cert_bundDE
Open Source MediaWiki< 1.42.7cert_bundDE
Open Source MediaWiki< 1.43.2cert_bundDE
Wikimedia Foundation Mediawiki - CheckUser extension1.39.x → 1.39.13enisa_euvdEU
Wikimedia Foundation Mediawiki - CheckUser extension1.42.x → 1.42.7enisa_euvdEU
Wikimedia Foundation Mediawiki - CheckUser extension1.43.x → 1.43.2enisa_euvdEU

advisories (1)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-1525MediaWiki Extensions und Skins: Mehrere SchwachstellenDeutsch2025-07-09csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in MediaWiki ausnutzen, um SQL-Injection- und XSS-Angriffe durchzuführen, Sicherheitsmechanismen zu umgehen, vertrauliche Informationen offenzulegen oder sich unbefugt höhere Berechtigungen zu verschaffen.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cert_bund NVD CVE.org MITRE

published 2025-07-08modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan