Cross-site scripting (XSS) vulnerability in file_download.php in MantisBT before 1.2.18 allows remote authenticated users to inject arbitrary web script or HTML via a Flash file with an image extension, related to inline attachments, as demonstrated by a .swf.jpeg filename.
https://github.com/mantisbt/mantisbt/commit/9fb8cf36f
http://www.debian.org/security/2015/dsa-3120
http://secunia.com/advisories/62101
http://seclists.org/oss-sec/2014/q4/924