CVE-2026-34087: Mediawiki

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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

Affected products

• Mediawiki Mediawiki: before 1.43.7 (fixed in 1.43.7); from 1.44.0, before 1.44.4 (fixed in 1.44.4); from 1.45.0, before 1.45.2 (fixed in 1.45.2)

Published 2026-05-11. Last modified 2026-06-17.