phpBB 2.0.17 and earlier, when register_globals is enabled and the session_start function has not been called to handle a session, allows remote attackers to bypass security checks by setting the $_SESSION and $HTTP_SESSION_VARS variables to strings instead of arrays, which causes an array_merge function call to fail.
phpBB 2.0.17 and earlier, when the register_long_arrays directive is disabled, allows remote attackers to modify global variables and bypass security mechanisms because PHP does not define the associated HTTP_* variables.
Multiple cross-site scripting (XSS) vulnerabilities in phpBB 2.0.17 and earlier allow remote attackers to inject arbitrary web script or HTML via the (1) error_msg parameter to usercp_register.php, (2) forward_page parameter to login.php, and (3) list_cat parameter to search.php, which are not initialized as variables.
SQL injection vulnerability in usercp_register.php in phpBB 2.0.17 allows remote attackers to execute arbitrary SQL commands via the signature_bbcode_uid parameter, which is not properly initialized.
usercp_register.php in phpBB 2.0.17 allows remote attackers to modify regular expressions and execute PHP code via the signature_bbcode_uid parameter, as demonstrated by injecting an "e" modifier into a preg_replace statement.
The bbencode_second_pass and make_clickable functions in bbcode.php for phpBB before 2.0.15, as used in viewtopic.php, privmsg.php, and other scripts, allow remote attackers to execute arbitrary script via a BBcode tag with a (1) javascript:, (2) applet:, (3) about:, (4) activex:, (5) chrome:, or (6) script: URI scheme, as demonstrated using the URL tag.
phpBB 2.0.13 and earlier allows remote attackers to obtain sensitive information via a direct request to oracle.php, which reveals the path in a PHP error message.
Cross-site scripting (XSS) vulnerability in usercp_register.php for phpBB 2.0.13 allows remote attackers to inject arbitrary web script or HTML by setting the (1) allowhtml, (2) allowbbcode, or (3) allowsmilies parameters to inject HTML into signatures for personal messages, possibly when they are processed by privmsg.php or viewtopic.php.
Multiple SQL injection vulnerabilities in album_search.php in Photo Album 2.0.53 for phpBB allow remote attackers to execute arbitrary SQL commands via the (1) mode or (2) search parameters.
Multiple cross-site scripting (XSS) vulnerabilities in Photo Album 2.0.53 module for phpBB allow remote attackers to inject arbitrary web script or HTML via the bsid parameter to (1) album_cat.php or (2) album_comment.php.