CVE-2026-34091

User localization leaked by AbuseFilter + EventStream

CVSS 5.5 MEDIUMEPSS 0.3%CWE-200

Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Wikimedia Foundation MediaWiki. This issue affects MediaWiki: from * before 1.43.7, 1.44.4, 1.45.2.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P/R:U

Affected products

Wikimedia Foundation · MediaWiki

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References

https://phabricator.wikimedia.org/T411305