The login form in Roundcube Webmail before 0.5.1 does not properly handle a correctly authenticated but unintended login attempt, which makes it easier for remote authenticated users to obtain sensitive information by arranging for a victim to login to the attacker's account and then compose an e-mail message, related to a "login CSRF" issue.

Roundcube 0.3.1 and earlier does not request that the web browser avoid DNS prefetching of domain names contained in e-mail messages, which makes it easier for remote attackers to determine the network location of the webmail user by logging DNS requests.

Cross-site request forgery (CSRF) vulnerability in Roundcube Webmail 0.2.2 and earlier allows remote attackers to hijack the authentication of unspecified users for requests that send arbitrary emails via unspecified vectors, a different vulnerability than CVE-2009-4076.

Cross-site request forgery (CSRF) vulnerability in Roundcube Webmail 0.2.2 and earlier allows remote attackers to hijack the authentication of unspecified users for requests that modify user information via unspecified vectors, a different vulnerability than CVE-2009-4077.

Cross-site scripting (XSS) vulnerability in RoundCube Webmail (roundcubemail) 0.2 stable allows remote attackers to inject arbitrary web script or HTML via the background attribute embedded in an HTML e-mail message.

RoundCube Webmail (roundcubemail) before 0.2-beta allows remote attackers to cause a denial of service (memory consumption) via crafted size parameters that are used to create a large quota image.