Bugzilla 3.2 before 3.2 RC2, 3.0 before 3.0.6, 2.22 before 2.22.6, 2.20 before 2.20.7, and other versions after 2.17.4 allows remote authenticated users to bypass moderation to approve and disapprove quips via a direct request to quips.cgi with the action parameter set to "approve."
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00687.html
https://www.redhat.com/archives/fedora-package-announce/2009-March/msg00664.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/46424
https://bugzilla.mozilla.org/show_bug.cgi?id=449931
http://www.securityfocus.com/bid/32178
http://www.bugzilla.org/security/2.20.6/