bug_actiongroup.php in MantisBT before 1.2.9 does not properly check the report_bug_threshold permission of the receiving project when moving a bug report, which allows remote authenticated users with the report_bug_threshold and move_bug_threshold privileges for a project to bypass intended access restrictions and move bug reports to a different project.
lists.fedoraproject.org/pipermail/package-announce/2012-November/092926.html
lists.fedoraproject.org/pipermail/package-announce/2012-November/093063.html
lists.fedoraproject.org/pipermail/package-announce/2012-November/093064.html
secunia.com/advisories/48258
secunia.com/advisories/49572
secunia.com/advisories/51199
security.gentoo.org/glsa/glsa-201211-01.xml
www.debian.org/security/2012/dsa-2500
www.mantisbt.org/bugs/changelog_page.php?version_id=140
www.mantisbt.org/bugs/view.php?id=13748
www.openwall.com/lists/oss-security/2012/03/06/9
www.securityfocus.com/bid/52313
github.com/mantisbt/mantisbt/commit/0da3f7ace233208eb3c8d628cc2fd6e56d83839f