admin.php in Phorum before 5.1.22 allows remote attackers to obtain the full path via the module[] parameter.
code.php3 in Phorum 3.0.7 allows remote attackers to read arbitrary files in the phorum directory via the query string.
Backdoor in auth.php3 in Phorum 3.0.7 allows remote attackers to access restricted web pages via an HTTP request with the PHP_AUTH_USER parameter set to "boogieman".
Directory traversal vulnerability in download.php in Phorum 3.4 through 3.4.2 allows remote attackers to read arbitrary files.
Phorum 5.2.15a allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by css.php and certain other files.