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thunderbird vulnerabilities · Page 8

Vulnerabilities published for thunderbird in the last 30 days: 107. Listed in the KEV catalogue: 0.

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Vulnerabilities: 1167

  1. CVE-2026-84143

    Critical · CVSS 9.8EPSS 0.38%Fix available

    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.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  2. CVE-2026-84145

    High · CVSS 7.5EPSS 0.37%Fix available

    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 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  3. CVE-2026-84131

    High · CVSS 8.8EPSS 0.33%Fix available

    Privilege escalation due to invalid pointer in the Graphics component

    Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  4. CVE-2026-84121

    Critical · CVSS 9.6EPSS 0.32%Fix available

    Sandbox escape due to use-after-free in the DOM: Security component

    Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  5. CVE-2026-84119

    Critical · CVSS 9.6EPSS 0.32%Fix available

    Sandbox escape due to use-after-free in the DOM: Navigation component

    Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  6. CVE-2026-75874

    Critical · CVSS 10EPSS 0.46%Fix available

    Sandbox escape in the Remote Settings Client component

    Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.

    • Update to 1:140.15.0esr-1~deb12u1
    Published Updated
  7. CVE-2026-74990

    Critical · CVSS 9.8EPSS 0.71%Fix available

    Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154

    Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. 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 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

    • Update to 1:140.14.0esr-1~deb12u1
    Published Updated
  8. CVE-2026-74987

    Critical · CVSS 9.8EPSS 0.71%Fix available

    Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbird 154

    Internally found bugs present in Thunderbird ESR 140.13, Thunderbird ESR 153.0 and Thunderbird 153. 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 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

    • Update to 1:140.14.0esr-1~deb12u1
    Published Updated
  9. CVE-2026-74974

    Medium · CVSS 5.4EPSS 0.17%Fix available

    Same-origin policy bypass in the Graphics: ImageLib component

    Same-origin policy bypass in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

    • Update to 1:140.14.0esr-1~deb12u1
    Published Updated
  10. CVE-2026-74973

    Medium · CVSS 4.2EPSS 0.21%Fix available

    Race condition, use-after-free in the Graphics component

    Race condition, use-after-free in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

    • Update to 1:140.14.0esr-1~deb12u1
    Published Updated
  11. CVE-2026-74971

    Medium · CVSS 4.3EPSS 0.35%Fix available

    Information disclosure in the DOM: UI Events & Focus Handling component

    Information disclosure in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

    • Update to 1:140.14.0esr-1~deb12u1
    Published Updated

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