Mozilla Thunderbird is a standalone mail and newsgroup client.
A flaw was found in the way Thunderbird processed text/enhanced and text/richtext formatted mail message. A specially crafted mail message could execute arbitrary code with the privileges of the user running Thunderbird. (CVE-2007-1282)
Several cross-site scripting (XSS) flaws were found in the way Thunderbird processed certain malformed HTML mail messages. A malicious HTML mail message could display misleading information which may result in a user unknowingly divulging sensitive information such as a password. (CVE-2006-6077, CVE-2007-0995, CVE-2007-0996)
A flaw was found in the way Thunderbird cached web content on the local disk. A malicious HTML mail message may be able to inject arbitrary HTML into a browsing session if the user reloads a targeted site. (CVE-2007-0778)
A flaw was found in the way Thunderbird displayed certain web content. A malicious HTML mail message could generate content which could overlay user interface elements such as the hostname and security indicators, tricking a user into thinking they are visiting a different site. (CVE-2007-0779)
Two flaws were found in the way Thunderbird displayed blocked popup windows. If a user can be convinced to open a blocked popup, it is possible to read arbitrary local files, or conduct an XSS attack against the user. (CVE-2007-0780, CVE-2007-0800)
Two buffer overflow flaws were found in the Network Security Services (NSS) code for processing the SSLv2 protocol. Connecting to a malicious secure web server could cause the execution of arbitrary code as the user running Thunderbird. (CVE-2007-0008, CVE-2007-0009)
A flaw was found in the way Thunderbird handled the "location.hostname" value during certain browser domain checks. This flaw could allow a malicious HTML mail message to set domain cookies for an arbitrary site, or possibly perform an XSS attack. (CVE-2007-0981)
Users of Thunderbird are advised to apply this update, which contains Thunderbird version 188.8.131.52 that corrects these issues.