Multiple cross-site request forgery (CSRF) vulnerabilities in Roundcube Webmail before 1.0.4 allow remote attackers to hijack the authentication of unspecified victims via unknown vectors, related to (1) address book operations or the (2) ACL or (3) Managesieve plugins.
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.