CVE-2017-8814
The language converter in MediaWiki before 1.27.4, 1.28.x before 1.28.3, and 1.29.x before 1.29.2 allows attackers to replace text inside tags via a rule definition followed by "a lot of junk."
Date published : 2017-11-15
https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-November/000216.html