Mozilla has published a security advisory, highlighting vulnerabilities in the Thunderbird on November 3rd, 2021. It is recommended that you take the necessary precautions by ensuring your products are always updated.
Thunderbird versions prior to 91.3
For more information on this update, you can follow this URL:
https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/
The Guyana National CIRT recommends that users and administrators review this update and apply it where necessary.
PDF Download: Mozilla Security Advisory.pdf
References
Mozilla security advisory (3rd November 2021). Retrieved from Canadian Centre for Cyber Security.
Mozilla security advisory (3rd November 2021). Retrieved from Centre for Internet Security.