MantisBT 1.2.4 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by view_all_inc.php and certain other files.
http://www.openwall.com/lists/oss-security/2011/06/27/6
http://security.gentoo.org/glsa/glsa-201211-01.xml
http://secunia.com/advisories/51199
http://code.google.com/p/inspathx/source/browse/trunk/paths_vuln/%21_README