Mediawiki · Mediawiki Cleanchanges Extension · CVE-2013-4569
**Name of the Vulnerable Software and Affected Versions**
MediaWiki CleanChanges extension versions prior to 1.19.9
MediaWiki CleanChanges extension versions 1.20.x prior to 1.20.8
MediaWiki CleanChanges extension versions 1.21.x prior to 1.21.3
**Description**
The issue allows remote attackers to obtain sensitive information, specifically revision-deleted IPs, via the Recent Changes page when the "Group changes by page in recent changes and watchlist" option is enabled.
**Recommendations**
For versions prior to 1.19.9, update to version 1.19.9 or later.
For versions 1.20.x prior to 1.20.8, update to version 1.20.8 or later.
For versions 1.21.x prior to 1.21.3, update to version 1.21.3 or later.