CVE-2026-34091

User localization leaked by AbuseFilter + EventStream

State: Published
Severity: 5.5 Medium
Published: May 11, 2026
Updated: May 11, 2026
Reserved: Mar 25, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	5.5 Medium	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	wikimedia-foundation

Weaknesses

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

Affected Products

Product	Versions
MediaWikiWikimedia Foundation	before 1.43.7, 1.44.4, 1.45.2Affected

References

https://phabricator.wikimedia.org/T411305

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