XOOPS Core 2.5.8.1 has XSS due to unescaped HTML output of an Install DB failure error message in pagedbsettings.php.
SQL injection vulnerability in XOOPS 2.5.7.2 and other versions before 2.5.8.1 allows remote authenticated administrators to execute arbitrary SQL commands via the url parameter to findusers.php. An example attack uses "into outfile" to create a backdoor program.