CVE-2015-6727
The Special:DeletedContributions page in MediaWiki before 1.23.10, 1.24.x before 1.24.3, and 1.25.x before 1.25.2 allows remote attackers to determine if an IP is autoblocked via the "Change block" text.
Date published : 2015-09-01
https://github.com/wikimedia/mediawiki/commit/5faabfa1bbf65536ea36108887040198afcb3c82