Memory safety bugs present in Thunderbird 140.10 and Thunderbird 150. 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. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

mozilla mfsa2026-50: Security Vulnerabilities fixed in Thunderbird 151

mozilla mfsa2026-51: Security Vulnerabilities fixed in Thunderbird 140.11

The version of Firefox installed on the remote macOS or Mac OS X host is prior to 151.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-46 advisory.

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

  - Memory safety bugs present in Firefox 150. 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-2026-8973)

  - Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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-2026-8974)

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 140.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-48 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8401)

  - Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in     Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8388)

  - Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8391)

  - Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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-2026-8974)

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

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 140.11. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-48 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8401)

  - Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in     Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8388)

  - Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8391)

  - Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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-2026-8974)

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

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 115.36. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-47 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8401)

  - Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in     Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8388)

  - Other issue in the JavaScript Engine component (CVE-2026-8391)

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

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 151.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-46 advisory.

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

  - Memory safety bugs present in Firefox 150. 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-2026-8973)

  - Memory safety bugs present in Firefox ESR 140.10 and Firefox 150. 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-2026-8974)

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 115.36. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-47 advisory.

  - Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox     ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8401)

  - Incorrect boundary conditions in the JavaScript Engine: JIT component. This vulnerability was fixed in     Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. (CVE-2026-8388)

  - Other issue in the JavaScript Engine component (CVE-2026-8391)

  - Memory safety bugs present in Firefox ESR 115.35, Firefox ESR 140.10 and Firefox 150. 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-2026-8975)

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
315327	Mozilla Firefox < 151.0	Nessus	MacOS X Local Security Checks	critical
315326	Mozilla Firefox ESR < 140.11	Nessus	MacOS X Local Security Checks	critical
315325	Mozilla Firefox ESR < 140.11	Nessus	Windows	critical
315324	Mozilla Firefox ESR < 115.36	Nessus	Windows	critical
315323	Mozilla Firefox < 151.0	Nessus	Windows	critical
315322	Mozilla Firefox ESR < 115.36	Nessus	MacOS X Local Security Checks	critical

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