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Mozilla has released security updates to address vulnerabilities in Firefox, Firefox ESR, and Thunderbird. An attacker could exploit these vulnerabilities to take control of an affected system.
CERT Bulgaria encourages users and administrators to review the Mozilla security advisories for Firefox 86, Firefox ESR 78.8, and Thunderbird 78.8 and apply the necessary updates.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-08/
https://www.mozilla.org/en-US/security/advisories/mfsa2021-09/