The "forgot password" function in OneOrZero Helpdesk before 1.6.5.4 generates insecure passwords by concatenating the current timestamp with the username, which allows remote attackers to gain access as an arbitrary user by requesting a password reset.

Incomplete blacklist vulnerability in the stripScripts function in common.php in OneOrZero Helpdesk 1.6.5.4, 1.6.4.2, and possibly other versions, allows remote attackers to conduct cross-site scripting (XSS) attacks and inject arbitrary web script or HTML via XSS sequences without SCRIPT tags in the description parameter to (1) tcreate.php or (2) tupdate.php, as demonstrated using an onmouseover event in a b tag.

Directory traversal vulnerability in login.php in OneOrZero Helpdesk 1.6.5.7 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the default_language parameter.

SQL injection vulnerability in one||zero (aka One or Zero) Helpdesk 1.4 rc4 allows remote attackers to modify arbitrary ticket number descriptions via the sg parameter.

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.