Interpretation conflict in includes/mainfile.php in PHP-Nuke 7.9 and later allows remote attackers to perform cross-site scripting (XSS) attacks by replacing the \>\ in the tag with a \<\ which bypasses the regular expressions that sanitize the data but is automatically corrected by many web browsers. NOTE: it could be argued that this vulnerability is due to a design limitation of many web browsers; if so then this should not be treated as a vulnerability in PHP-Nuke.