Cross-site scripting (XSS) vulnerability in index.php in Vanilla Forums before 2.0.17 allows remote attackers to inject arbitrary web script or HTML via the Target parameter in a /entry/signin action.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2011-0546
http://yehg.net/lab/pr0js/advisories/%5Bvanilla_forums-2.0.16%5D_cross_site_scripting
http://www.vanillaforums.org/discussion/14397/vanilla-2.0.17-released
http://secunia.com/advisories/43074