CVE-2025-6589: With MultiBlocks enabled and a user who is suppressed via a MultiBlock, a user without 'hideuser' can see the hidden username in the BlockList

Severity: low (CVSS 2.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-02 · updated 2026-06-17
Weakness: CWE-22

Description

Vulnerability in Wikimedia Foundation MediaWiki. This vulnerability is associated with program files includes/specials/pagers/BlockListPager.Php. This issue affects MediaWiki: >= 1.42.0.

Affected products

Wikimedia Foundation MediaWiki: from 1.42.0

References

https://phabricator.wikimedia.org/T391343

Get alerted when CVE-2025-6589 or the next vulnerability affects your stack