In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access. When a bot account has a “sitewide block” applied, it is able to still “purge” pages through the MediaWiki Action API (which a “sitewide block” should have prevented).
lists.debian.org/debian-lts-announce/2021/10/msg00003.html
lists.fedoraproject.org/archives/list/[email protected]/message/CJDYJQWT43GBD6GNQ4OW7JOZ6WQ6DZTN/
lists.fedoraproject.org/archives/list/[email protected]/message/MDBPECBWN6LWNSWIQMVXK6PP4YFEUYHA/
lists.fedoraproject.org/archives/list/[email protected]/message/QNEAI2T3Y65I55ZB6UE6RMC662RZTGRX/
lists.wikimedia.org/hyperkitty/list/[email protected]/thread/YR3X4L2CPSEJVSY543AWEO65TD6APXHP/
phabricator.wikimedia.org/T280226
security.gentoo.org/glsa/202107-40
www.debian.org/security/2021/dsa-4979