CVE-2026-34090 PUBLISHED

Suggested investigations: Handle suppressed usernames

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 CheckUser.

This issue affects CheckUser: from 1.45.0 before 1.45.2.

Metrics

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/R:U
CVSS Score: 4.8

Product Status

Vendor Wikimedia Foundation
Product CheckUser
Versions Default: unaffected
  • affected from 1.45.0 to 1.45.2 (excl.)

References

Problem Types

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