source: http://www.securityfocus.com/bid/9942/info

It has been reported that phpBB may be prone to multiple vulnerabilities that could allow an attacker to carry out SQL injection and cross-site scripting attacks. These vulnerabilities result from insufficient sanitization of user-supplied input via the 'id' parameter of 'admin_smilies.php' module and the 'style_id' parameter of 'admin_styles' module.

phpBB versions 2.0.7a and prior are reported to be prone to these issues.

admin_smilies.php?mode=edit&id=[SQL]
admin_smilies.php?mode=delete&id=[SQL]
admin_smilies.php?mode=edit&id=[XSS]
admin_smilies.php?mode=delete&id=[XSS]
admin_styles.php?mode=edit&style_id=[SQL]
admin_styles.php?mode=delete&style_id=[SQL]
admin_styles.php?mode=edit&style_id=[XSS]
admin_styles.php?mode=delete&style_id=[XSS]