Mozilla Thunderbird Security Advisory 2026-87: 14 CVEs, UAF, Sandbox Escape & LPE Fixes

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Security Advisory Mozilla Security Advisory 2026-87 High Mozilla

Affected:

Thunderbird (<140.15)
Thunderbird ESR 153 (<153.2)
Thunderbird (<155)

Fixed in:

Thunderbird 140.15
Thunderbird 153.2
Thunderbird 155

Referenced CVEs: CVE-2026-84640 CVE-2026-84641 CVE-2026-84639 CVE-2026-84143 CVE-2026-84124 CVE-2026-84122 CVE-2026-84145 CVE-2026-84131 CVE-2026-84121 CVE-2026-84120

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Mozilla Thunderbird Security Advisory 2026-87: 14 CVEs, UAF, Sandbox Escape & LPE Fixes