MediaWiki Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2013-4569
The CleanChanges extension for MediaWiki before 1.19.9 1.20.x before 1.20.8 and 1.21.x before 1.21.3 when quotGroup changes by page in recent changes and watchlistquot is enabled allows remote attackers to obtain sensitive information (revision-deleted IPs) via the Recent Changes page.