Mediawiki before 1.28.1 / 1.27.2 / 1.23.16 contains a flaw making rawHTML mode apply to system messages.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "mediawiki", "binary_version": "1:1.27.4-3" }, { "binary_name": "mediawiki-classes", "binary_version": "1:1.27.4-3" } ], "ubuntu_priority": "low" }