http://nvd.nist.gov/nvd.cfm?cvename=CVE-2006-6574 "Mantis before 1.1.0a2 does not implement per-item access control for Issue History (Bug History), which allows remote attackers to obtain sensitive information by reading the Change column, as demonstrated by the Change column of a custom field." All FE releases are possibly affected.
mantis references: http://www.mantisbt.org/bugs/view.php?id=7364 http://www.mantisbt.org/bugs/view.php?id=3375 both fixed in CVS
Patched packages are now published in all branches (FC5, FC6 and devel)