Mozilla Firefox ESR Security Advisory: Multiple High-Severity Vulnerabilities (Sandbox Escape/UAF)

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Security AdvisoryMFSA2026-03HighMozilla

Affected:

Firefox ESR
Firefox ESR 140.6
Thunderbird ESR
Thunderbird ESR 140.6
Firefox 146

Fixed in:

Firefox ESR 140.7
Thunderbird ESR 140.7
Firefox 147
Thunderbird 147

Referenced CVEs: CVE-2026-0890 CVE-2026-0891 CVE-2026-0887 CVE-2026-0884 CVE-2026-0885 CVE-2026-0886 CVE-2026-0882 CVE-2026-0883 CVE-2026-0880 CVE-2026-0878

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