one||zero (aka One or Zero) Helpdesk 1.4 rc4 allows remote attackers to create administrator accounts by directly calling the install.php Helpdesk Installation script.

SQL injection vulnerability in index.php for MyHelpDesk 20020509, and possibly other versions, allows remote attackers to conduct unauthorized activities via SQL code in the "id" parameter for the operations (1) detailticket, (2) editticket, or (3) updateticketlog.

Cross-site scripting vulnerabilities in MyHelpDesk 20020509, and possibly other versions, allows remote attackers to execute script as other users via a (1) Title or (2) Description when a new ticket is created by a support assistant, via the "id" parameter to the index.php script with the (3) tickettime, (4) ticketfiles, or (5) updateticketlog operations, or (6) via the update section when a ticket is edited.