Thunderbird 78.6.1 closes critical vulnerability

[German]The developers of the Thunderbird email client have released Thunderbird 78.6.1 on January 12, 2021. This is a maintenance update for the main 78 version of the email client that fixes security vulnerabilities.


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German blog reader Gerold pointed out the update here. According to the release notes, there are the following changes:

MailExtensions: browserAction, composeAction, and messageDisplayAction toolbar buttons now support label and default_label properties

In addition, the following bug fixes have been made:

  • when running a quick search that did not return any results, the user was not offered to run the search again as a global search
  • Fixed a bug in the message search toolbar
  • In case of very long subject lines, the compose and view message windows were distorted, making them unusable
  • Compose window: recipient addresses that had not been auto-completed were lost when clicking the Send button
  • Compose window: new message is no longer marked as "changed" when tabbing out of the recipient field without editing anything
  • Account self-detection when using MS Exchange servers fixed
  • Fixed stability problem with LDAP address book
  • Messages with invalid vcard attachments were not marked as read in the preview window
  • Chat: TLS certificate exceptions for XMPP connections could not be added
  • Calendar: system time zone was not always detected correctly
  • Calendar: descriptions were sometimes empty when editing a single occurrence of a repeating event
  • Various bug fixes for printing
  • Visual consistency and design improvements

In addition, there is a closed critical use-after-free vulnerability, which is documented here.

System requirements

The system requirements for the different operating system versions (see, where more details can be found): n

  • Windows: Windows 7, Windows Server 2008 R2 or higher
  • Mac: Mac OS X 10.9 or higher
  • Linux: GTK+ 3.4 or higher

The download is available here. By the way, Thunderbird is free of charge.


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