Search.pm in Bugzilla 2.19.1 through 3.2.7, 3.3.1 through 3.4.7, 3.5.1 through 3.6.1, and 3.7 through 3.7.2 allows remote attackers to determine the group memberships of arbitrary users via vectors involving the Search interface, boolean charts, and group-based pronouns.
https://bugzilla.redhat.com/show_bug.cgi?id=623423
https://bugzilla.mozilla.org/show_bug.cgi?id=417048
http://www.vupen.com/english/advisories/2010/2205
http://www.vupen.com/english/advisories/2010/2035
http://www.securityfocus.com/bid/42275
http://www.bugzilla.org/security/3.2.7/
http://secunia.com/advisories/41128
http://secunia.com/advisories/40892
http://lists.fedoraproject.org/pipermail/package-announce/2010-August/046546.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-August/046534.html
http://lists.fedoraproject.org/pipermail/package-announce/2010-August/046518.html