An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. By using an action=rollback query, attackers can view private wiki contents.
{ "availability": "No subscription required", "ubuntu_priority": "medium", "binaries": [ { "binary_version": "1:1.35.5-1", "binary_name": "mediawiki" }, { "binary_version": "1:1.35.5-1", "binary_name": "mediawiki-classes" } ] }