Ubuntu Brings Thunderbird 91 to Older Releases to Fix Security Flaw
Thunderbird 91 is being back-ported to Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. A security vulnerability affecting the Thunderbird 78.x series both builds offer is being actively exploited in the wild. But as upstream support for Thunderbird 78.x has ended the flaw is unlikely be ever be patched. For an Ubuntu LTS releases that’s a major issue. This isn’t the first time Ubuntu has needed to do this either. So, to ensure its users are not affected, Ubuntu developers are backporting the latest Thunderbird 91 release (which is an extended support release, thankfully) to Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 21.04. All supported Ubuntu releases receive new versions of Mozilla Firefox for the duration of their respective eras, but Mozilla Thunderbird (typically) only gets in-series updates. Ubuntu 18.04 LTS originally shipped with Thunderbird 52.x series, while Ubuntu 20.04 LTS came with the 68.x series. Both were updated to Thunderbird 78 last year. And, in the