Cross-site scripting (XSS) vulnerability in Phorum before 5.2.10 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.

Cross-site scripting (XSS) vulnerability in Phorum before 5.2.15 allows remote attackers to inject arbitrary web script or HTML via an invalid email address.

Multiple cross-site scripting (XSS) vulnerabilities in Phorum 5.0.17a and earlier allow remote attackers to inject arbitrary web script or HTML via (1) the username parameter to register.php or (2) a signature of a logged-in user in "My Control Center," which is not properly handled by control.php.

SQL injection vulnerability in search.php in Phorum 5.0.0alpha through 5.0.20, when registerglobals is enabled, allows remote attackers to execute arbitrary SQL commands via the forumids parameter.

CRLF injection vulnerability in search.php in Phorum 5.0.14a allows remote attackers to perform HTTP Response Splitting attacks via the body parameter, which is included in the resulting Location header.

Directory traversal vulnerability in pm.php in Phorum 5 allows remote authenticated users to include and execute arbitrary local files via directory traversal sequences in the GLOBALS[template] parameter, as demonstrated by injecting PHP sequences into a log file, which is then included by pm.php.