RT (aka Request Tracker) before 4.0.23 and 4.2.x before 4.2.10 allows remote attackers to hijack sessions via an RSS feed URL.
http://www.debian.org/security/2015/dsa-3176
http://lists.fedoraproject.org/pipermail/package-announce/2015-March/154047.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-April/154213.html
http://blog.bestpractical.com/2015/02/security-vulnerabilities-in-rt.html