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.
http://www.vupen.com/english/advisories/2009/0368
http://www.securityfocus.com/bid/33681
http://www.debian.org/security/2009/dsa-1901
http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_6_12/phase3/RELEASE-NOTES
http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_13_4/phase3/RELEASE-NOTES
http://svn.wikimedia.org/svnroot/mediawiki/tags/REL1_12_4/phase3/RELEASE-NOTES
http://secunia.com/advisories/33881
http://lists.wikimedia.org/pipermail/mediawiki-announce/2009-February/000083.html