The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 154,     Thunderbird 154, Firefox ESR 153.2, and Thunderbird 153.2. (CVE-2026-74952)

Note that Nessus relies on the presence of the package as reported by the vendor.

The version of Thunderbird installed on the remote Windows host is prior to 153.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-88 advisory.

  - 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. (CVE-2026-84143, CVE-2026-84145)

  - Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.
    (CVE-2026-84639)

  - A maliciously constructed mail header could lead to a one byte read past the end of a buffer.
    (CVE-2026-84640)

  - A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID     response. Heap contents can ultimately be persisted to prefs.js. (CVE-2026-84641)

  - 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. (CVE-2026-84637)

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 Thunderbird installed on the remote macOS or Mac OS X host is prior to 153.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-88 advisory.

  - 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. (CVE-2026-84143, CVE-2026-84145)

  - Triggering an error condition in certain MIME bodies would cause uninitialized memory to be used.
    (CVE-2026-84639)

  - A maliciously constructed mail header could lead to a one byte read past the end of a buffer.
    (CVE-2026-84640)

  - A malicious IMAP server can trigger use-after-free and heap-memory disclosure by sending a crafted ID     response. Heap contents can ultimately be persisted to prefs.js. (CVE-2026-84641)

  - 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. (CVE-2026-84637)

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 153.2. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-85 advisory.

  - 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, and Firefox ESR 153.2. (CVE-2026-84131)

  - 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, and Firefox ESR 153.2. (CVE-2026-75874)

  - Use-after-free in the JavaScript: GC component. This vulnerability was fixed in Firefox 155 and Firefox     ESR 153.2. (CVE-2026-84118)

  - 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, and Firefox ESR 153.2. (CVE-2026-84119)

  - Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR     115.40, Firefox ESR 140.15, and Firefox ESR 153.2. (CVE-2026-84120)

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

ID	名前	製品	ファミリー	公開日	更新日	深刻度
338143	Linux Distros Unpatched Vulnerability : CVE-2026-74952	Nessus	Misc.	2026/8/19	2026/9/3	high
342259	Mozilla Thunderbird < 153.2	Nessus	Windows	2026/9/1	2026/10/21	critical
342260	Mozilla Thunderbird < 153.2	Nessus	MacOS X Local Security Checks	2026/9/1	2026/10/21	critical
342203	Mozilla Firefox ESR < 153.2	Nessus	MacOS X Local Security Checks	2026/9/1	2026/9/11	critical

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