In install/page_dbsettings.php in the Core distribution of XOOPS 2.5.8.1, unfiltered data passed to CREATE and ALTER SQL queries caused SQL Injection in the database settings page, related to use of GBK in CHARACTER SET and COLLATE clauses.

XOOPS Core 2.5.8.1 has XSS due to unescaped HTML output of an Install DB failure error message in page_dbsettings.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.