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 Request Forgery The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.