Mozilla Releases Security Update for Firefox, Firefox ESR, and Thunderbird

Original release date: April 20, 2021

Mozilla has released security updates to address vulnerabilities in Firefox, Firefox ESR, and Thunderbird. An attacker can exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review the Mozilla Security Advisories for Firefox 88, Firefox ESR 78.10, and Thunderbird 78.10, and apply the necessary updates.

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