CVE-2026-34091 PUBLISHED

User localization leaked by AbuseFilter + EventStream

Assigner: wikimedia-foundation
Reserved: 25.03.2026 Published: 11.05.2026 Updated: 11.05.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 5.5

Product Status

Vendor Wikimedia Foundation
Product MediaWiki
Versions Default: unaffected
  • affected from * to 1.43.7, 1.44.4, 1.45.2 (excl.)

References

Problem Types

  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor CWE