Bugzilla before 2.14 stores user passwords in plaintext and sends password requests in an email message, which could allow attackers to gain privileges.

Bugzilla before 2.14 does not restrict access to sanitycheck.cgi, which allows local users to cause a denial of service (CPU consumption) via a flood of requests to sanitycheck.cgi.

process_bug.cgi in Bugzilla before 2.14 does not set the "groupset" bit when a bug is moved between product groups, which will cause the bug to have the old group's restrictions, which might not be as stringent.

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.