OpenID allows remote attackers to forcibly log a user into an OpenID enabled site, divulge the user's personal information to this site, and add it site to the trusted sites list via a crafted web page, related to cached tokens.
Cross-site request forgery (CSRF) vulnerability in OpenID allows remote attackers to restore the login session of a user on an OpenID enabled site via unspecified vectors related to an arbitrary remote web site and cached tokens, after the user has signed into an OpenID server, logged into the OpenID enabled site, and then logged out of the OpenID enabled site.
PHP remote file inclusion vulnerability in includes/openid/Auth/OpenID/BBStore.php in phpBB Openid 0.2.0 allows remote attackers to execute arbitrary PHP code via a URL in the openidrootpath parameter.