Original release date: March 24, 2021
Mozilla has released security updates to address vulnerabilities in Firefox, Firefox ESR, and Thunderbird. A remote attacker could 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 87, Firefox ESR 78.9, and Thunderbird 78.9.
This product is provided subject to this Notification and this Privacy & Use policy.
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence…
Update October 30, 2026: CISA has updated this Alert to: (1) include CVE-2026-111357 and CVE-2026-118527…
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on…
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on…
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on…
CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on…
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