Bugzilla before 2.14 does not properly escape untrusted parameters, which could allow remote attackers to conduct unauthorized activities via cross-site scripting (CSS) and possibly SQL injection attacks on (1) the product or output form variables for reports.cgi, (2) the voteon, bug_id, and user variables for showvotes.cgi, (3) an invalid email address in createaccount.cgi, (4) an invalid ID in showdependencytree.cgi, (5) invalid usernames and other fields in process_bug.cgi, and (6) error messages in buglist.cgi.
http://www.redhat.com/support/errata/RHSA-2001-107.html
http://marc.info/?l=bugtraq&m=99912899900567
http://bugzilla.mozilla.org/show_bug.cgi?id=95235
http://bugzilla.mozilla.org/show_bug.cgi?id=87701
http://bugzilla.mozilla.org/show_bug.cgi?id=39536
http://bugzilla.mozilla.org/show_bug.cgi?id=38859