CVE-2025-12004: The compare API module breaks Extension:Lockdown

Severity: critical (CVSS 10.0 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-21 · updated 2026-10-18
Weakness: CWE-732

Description

Incorrect Permission Assignment for Critical Resource vulnerability in The Wikimedia Foundation Mediawiki - Lockdown Extension allows Privilege Abuse. Fixed in Mediawiki Core Action APIThis issue affects Mediawiki - Lockdown Extension: from master before 1.42.

Affected products

The Wikimedia Foundation Mediawiki - Lockdown Extension: from master before 1.42 — fixed in 1.42

How to fix

Upgrade to a fixed version: The Wikimedia Foundation Mediawiki - Lockdown Extension 1.42. Check the vendor advisory for mitigations.

References

https://gerrit.wikimedia.org/r/q/Id275382743957004fa7fc56318fc104d8e2d267b
https://phabricator.wikimedia.org/T397521
https://phabricator.wikimedia.org/T397521

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