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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

🗓️ 02 Feb 2026 23:03:45Reported by wikimedia-foundationType 
vulnrichment
 vulnrichment
🔗 github.com👁 3 Views

CVE-2025-6589: Hidden usernames exposed in BlockList when MultiBlock suppresses a user and viewer lacks hideuser in MediaWiki 1.42.0+.

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02 Feb 2026 23:03Current
5.3Medium risk
Vulners AI Score5.3
CVSS 42.1
EPSS0.00445
SSVC
3