Updated mediawiki packages fix security vulnerabilities:
Kevin Israel (Wikipedia user PleaseStand) identified and reported two vectors for injecting Javascript in CSS that bypassed MediaWiki's blacklist (CVE-2013-4567, CVE-2013-4568).
Internal review while debugging a site issue discovered that MediaWiki and the CentralNotice extension were incorrectly setting cache headers when a user was autocreated, causing the user's session cookies to be cached, and returned to other users (CVE-2013-4572).