Cross-site scripting (XSS) vulnerability in viewtopic.php in Xoops 2.x, possibly 2 through 2.0.5, allows remote attackers to inject arbitrary web script or HTML via the (1) forum and (2) topic_id parameters.

XOOPS 2.0, and possibly earlier versions, allows remote attackers to obtain sensitive information via an invalid xoopsOption parameter, which reveals the installation path in an error message.

Cross-site scripting (XSS) vulnerability in the MytextSanitizer function in XOOPS 1.3.5 through 1.3.9 and XOOPS 2.0 through 2.0.1 allows remote attackers to inject arbitrary web script or HTML via a javascript: URL in an IMG tag.

Cross-site scripting (XSS) vulnerability in the Quizz module for XOOPS 1.0, when allowing on-line question development, allows remote attackers to inject arbitrary web script or HTML via a javascript: URL in the SRC attribute of an IMG tag.

SQL injection vulnerability in index.php of WebChat 1.5 included in XOOPS 1.0 allows remote attackers to execute arbitrary SQL commands via the roomid parameter.

Cross-site scripting (XSS) vulnerability in Xoops 1.0 RC3 allows remote attackers to inject arbitrary web script or HTML via Javascript in an IMG tag when submitting news.

Cross-site scripting (CSS) vulnerabilities in the Private Message System for XOOPS 1.0 RC1 allow remote attackers to execute Javascript on other web clients via (1) the Title field or a Private Message Box or (2) the image field parameter in pmlite.php.

userinfo.php in XOOPS 1.0 RC1 allows remote attackers to obtain sensitive information via a SQL injection attack in the "uid" parameter.