Multiple cross-site scripting (XSS) vulnerabilities in the web-based installer (config/index.php) in MediaWiki 1.6 before 1.6.12, 1.12 before 1.12.4, and 1.13 before 1.13.4, when the installer is in active use, allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.
lists.wikimedia.org/pipermail/mediawiki-announce/2009-February/000083.html
secunia.com/advisories/33881
svn.wikimedia.org/svnroot/mediawiki/tags/REL1_12_4/phase3/RELEASE-NOTES
svn.wikimedia.org/svnroot/mediawiki/tags/REL1_13_4/phase3/RELEASE-NOTES
svn.wikimedia.org/svnroot/mediawiki/tags/REL1_6_12/phase3/RELEASE-NOTES
www.debian.org/security/2009/dsa-1901
www.securityfocus.com/bid/33681
www.vupen.com/english/advisories/2009/0368