Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.

mozilla mfsa2026-60: Security Vulnerabilities fixed in Thunderbird 152

mozilla mfsa2026-61: Security Vulnerabilities fixed in Thunderbird 140.12

The version of Firefox ESR installed on the remote Windows host is prior to 115.37. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-59 advisory.

  - Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151     and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code. (CVE-2026-12328)

  - Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152,     Firefox ESR 140.12, and Firefox ESR 115.37. (CVE-2026-12289)

  - Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12,     and Firefox ESR 115.37. (CVE-2026-12290)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12294)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 115.37. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-59 advisory.

  - Memory safety bugs present in Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151     and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with     enough effort some of these could have been exploited to run arbitrary code. (CVE-2026-12328)

  - Privilege escalation in the Graphics: WebRender component. This vulnerability was fixed in Firefox 152,     Firefox ESR 140.12, and Firefox ESR 115.37. (CVE-2026-12289)

  - Memory safety bug fixed in Firefox 152. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12,     and Firefox ESR 115.37. (CVE-2026-12290)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Sandbox escape in the DOM: Workers component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12294)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote Windows host is prior to 152.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-57 advisory.

  - Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. (CVE-2026-12327)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152 and     Firefox ESR 140.12. (CVE-2026-12292)

  - Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12295)

  - Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152     and Firefox ESR 140.12. (CVE-2026-12296)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote macOS or Mac OS X host is prior to 140.12. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-58 advisory.

  - Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. (CVE-2026-12327)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152 and     Firefox ESR 140.12. (CVE-2026-12292)

  - Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12295)

  - Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152     and Firefox ESR 140.12. (CVE-2026-12296)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 152.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-57 advisory.

  - Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. (CVE-2026-12327)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152 and     Firefox ESR 140.12. (CVE-2026-12292)

  - Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12295)

  - Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152     and Firefox ESR 140.12. (CVE-2026-12296)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Firefox ESR installed on the remote Windows host is prior to 140.12. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-58 advisory.

  - Memory safety bugs present in Firefox ESR 140.11, Thunderbird ESR 140.11, Firefox 151 and Thunderbird 151.
    Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of     these could have been exploited to run arbitrary code. (CVE-2026-12327)

  - Use-after-free in the Networking: HTTP component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12291)

  - Incorrect boundary conditions in the Web Audio component. This vulnerability was fixed in Firefox 152 and     Firefox ESR 140.12. (CVE-2026-12292)

  - Sandbox escape in the DOM: Navigation component. This vulnerability was fixed in Firefox 152, Firefox ESR     140.12, and Firefox ESR 115.37. (CVE-2026-12295)

  - Sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152     and Firefox ESR 140.12. (CVE-2026-12296)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Severity
321204	Mozilla Firefox ESR < 115.37	Nessus	Windows	high
321203	Mozilla Firefox ESR < 115.37	Nessus	MacOS X Local Security Checks	high
321196	Mozilla Firefox < 152.0	Nessus	Windows	critical
321195	Mozilla Firefox ESR < 140.12	Nessus	MacOS X Local Security Checks	critical
321194	Mozilla Firefox < 152.0	Nessus	MacOS X Local Security Checks	critical
321193	Mozilla Firefox ESR < 140.12	Nessus	Windows	critical

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CVE-2026-12302

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