Multiple vulnerabilities in phpMyChat before 0.14.5 exist in (1) input.php3, (2) handle_inputH.php3, or (3) index.lib.php3 with unknown consequences, possibly related to user spoofing or improperly initialized variables.

Vulnerabilities in phpMyChat before 0.14.4 allow local and possibly remote attackers to gain privileges by specifying an alternate library file in the L (localization) parameter.

Multiple cross-site scripting (XSS) vulnerabilities in (1) start_page.css.php3 (aka start-page.css.php3) or (2) style.css.php3 in PHPMyChat 0.14.5 allow remote attackers to inject arbitrary web script or HTML commands via the FontName parameter. NOTE: it was later reported that 0.14.5 is also affected.

Multiple cross-site scripting (XSS) vulnerabilities in phpMyChat 0.14.6 allow remote attackers to inject arbitrary web script or HTML via the medium parameter to (1) start_page.css.php and (2) style.css.php; or the From parameter to users_popupL.php.

SQL injection vulnerability in chat/messagesL.php3 in phpHeaven Team PHPMyChat 0.14.5 and earlier allows remote attackers to execute arbitrary SQL commands via the T parameter. NOTE: this issue can be leveraged to execute arbitrary shell commands since the username is later processed in an eval() call, but since the username originated from the SQL injection, it could be a resultant issue.

PHP remote file inclusion vulnerability in connected_users.lib.php3 in phpHeaven phpMyChat 0.1 allows remote attackers to execute arbitrary PHP code via a URL in the ChatPath parameter.