The activation resend function in the Profiles module in XOOPS before 2.4.1 sends activation codes in response to arbitrary activation requests, which allows remote attackers to bypass administrative approval via a request involving activate.php.
Multiple cross-site scripting (XSS) vulnerabilities in XOOPS 2.3.3 allow remote attackers to inject arbitrary web script or HTML via the (1) op parameter to modules/pm/viewpmsg.php and (2) query string to modules/profile/user.php.