PHP remote file inclusion vulnerability in MediaWikiParserTest.php in MediaWiki 1.16 beta, when register_globals is enabled, allows remote attackers to execute arbitrary PHP code via unspecified vectors.
http://openwall.com/lists/oss-security/2010/07/29/4
http://lists.wikimedia.org/pipermail/mediawiki-announce/2010-July/000092.html