Mozilla Thunderbird 2026-86 Advisory: Multi-component vulnerabilities, CVE mapping & fix

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Security Advisory SA-THUNDERBIRD-2026-86 High Mozilla

Affected:

Mozilla Thunderbird (pre-155)
Mozilla Thunderbird ESR 153
Mozilla Thunderbird ESR 140

Fixed in:

Mozilla Thunderbird 155
Mozilla Thunderbird ESR 153.2
Mozilla Thunderbird ESR 140.15

Referenced CVEs: CVE-2026-84642 CVE-2026-84641 CVE-2026-84640 CVE-2026-84639 CVE-2026-84144 CVE-2026-84143 CVE-2026-84141 CVE-2026-84139 CVE-2026-84138 CVE-2026-84137

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Mozilla Thunderbird 2026-86 Advisory: Multi-component vulnerabilities, CVE mapping & fix