Bugzilla before 2.14 allows Bugzilla users to bypass group security checks by marking a bug as the duplicate of a restricted bug, which adds the user to the CC list of the restricted bug and allows the user to view the bug.
Bugzilla 2.10 allows remote attackers to execute arbitrary commands via shell metacharacters in a username that is then processed by (1) the Bugzilla_login cookie in post_bug.cgi, or (2) the who parameter in process_bug.cgi.
Bugzilla 2.10 allows remote attackers to access sensitive information, including the database username and password, via an HTTP request for the globals.pl file, which is normally returned by the web server without being executed.