Joomla! before 1.5 RC4 allows remote authenticated administrators to promote arbitrary users to the administrator group, in violation of the intended security model.
Multiple cross-site request forgery (CSRF) vulnerabilities in Joomla! before 1.5 RC4 allow remote attackers to (1) add a Super Admin, (2) upload an extension containing arbitrary PHP code, and (3) modify the configuration as administrators via unspecified vectors.
Cross-site scripting (XSS) vulnerability in the compoll component in Joomla! before 1.5 RC4 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.