A Bugzilla Security Advisory reports:
The following security issues have been discovered in Bugzilla:
Due to a lack of validation of the enctype form attribute when making POST requests to xmlrpc.cgi, a possible CSRF vulnerability was discovered. If a user visits an HTML page with some malicious HTML code in it, an attacker could make changes to a remote Bugzilla installation on behalf of the victim's account by using the XML-RPC API on a site running mod_perl. Sites running under mod_cgi are not affected. Also, the user would have had to be already logged in to the target site for the vulnerability to work.
All affected installations are encouraged to upgrade as soon as possible.