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thunderbird vulnerabilities · Page 22

Vulnerabilities published for thunderbird in the last 30 days: 263. Listed in the KEV catalogue: 0.

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Vulnerabilities: 1304

  1. CVE-2026-84637

    Critical · CVSS 9.8EPSS 0.63%No fix published

    Calendar invitation attachments could launch local executables

    Malicious calendar invitations could use file URI attachments to launch local or network-hosted executables on Windows, bypassing Thunderbird's normal executable attachment protections. With the new invitation display enabled, the attachment could also appear under a misleading filename. This vulnerability was fixed in Thunderbird 154 and Thunderbird 153.2.

    Published Updated
  2. CVE-2026-84144

    High · CVSS 7.5EPSS 0.43%No fix published

    Internally found bugs fixed in Thunderbird 155 and Thunderbird ESR 153.2

    Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

    Published Updated
  3. CVE-2026-84143

    Critical · CVSS 9.8EPSS 0.38%No fix published

    Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

    Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

    Published Updated
  4. CVE-2026-84142

    Critical · CVSS 9.8EPSS 0.56%No fix published

    Internally found bugs fixed in Thunderbird 155

    Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155 and Thunderbird 155.

    Published Updated

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