Cross-site scripting (XSS) vulnerability in add.php in Hinton Design phphd 1.0 allows remote attackers to inject arbitrary web script or HTML via unknown vectors.

check.php in Hinton Design phphd 1.0 does not check passwords when certain cookies are provided, which allows remote attackers to bypass authentication.

Multiple SQL injection vulnerabilities in Hinton Design phphd 1.0 allow remote attackers to execute arbitrary SQL commands via (1) the username parameter to check.php or (2) unknown attack vectors to scripts that display information from the database.