The version of Firefox installed on the remote macOS or Mac OS X host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-30 advisory.

  - Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149.
    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-2026-6786)

  - Memory safety bugs present in Firefox 149 and Thunderbird 149. 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-2026-6784)

  - Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149     and Thunderbird 149. 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-2026-6785)

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 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-33 advisory.

  - Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR     140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6771)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

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

The remote Redhat Enterprise Linux 8 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:10766 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772)

    * firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)

    * firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)

    * firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)

    * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757)

    * firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox     150 and Thunderbird 150 (CVE-2026-6786)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)

    * firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)

    * firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)

    * firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D     component (CVE-2026-6749)

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766)

    * firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)

    * firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)

    * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird     ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)

    * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)

    * firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component     (CVE-2026-6764)

    * firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)

    * firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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 140.10. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-34 advisory.

  - Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR     140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6771)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

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

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4549 advisory.

    - -------------------------------------------------------------------------     Debian LTS Advisory DLA-4549-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/               Emilio Pozuelo Monfort     April 26, 2026                                https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : thunderbird     Version        : 1:140.10.0esr-1~deb11u1     CVE ID         : CVE-2026-6746 CVE-2026-6747 CVE-2026-6748 CVE-2026-6749                      CVE-2026-6750 CVE-2026-6751 CVE-2026-6752 CVE-2026-6753                      CVE-2026-6754 CVE-2026-6757 CVE-2026-6761 CVE-2026-6762                      CVE-2026-6763 CVE-2026-6764 CVE-2026-6765 CVE-2026-6766                      CVE-2026-6767 CVE-2026-6769 CVE-2026-6770 CVE-2026-6771                      CVE-2026-6772 CVE-2026-6776 CVE-2026-6785 CVE-2026-6786

    Multiple security issues were discovered in Thunderbird, which could     result in the execution of arbitrary code.

    For Debian 11 bullseye, these problems have been fixed in version     1:140.10.0esr-1~deb11u1.

    We recommend that you upgrade your thunderbird packages.

    For the detailed security status of thunderbird please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/thunderbird

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

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 Windows host is prior to 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-33 advisory.

  - Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR     140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6771)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

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

The remote Fedora 44 host has packages installed that are affected by multiple vulnerabilities as referenced in the FEDORA-2026-fb08ad61f2 advisory.

    Update NSS to 3.122.1     Update to Firefox 150.0


    ----

    - New upstream release (149.0.2)

Tenable has extracted the preceding description block directly from the Fedora security advisory.

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

The remote Redhat Enterprise Linux 10 host has a package installed that is affected by multiple vulnerabilities as referenced in the RHSA-2026:10767 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772)

    * firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)

    * firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)

    * firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)

    * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757)

    * firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox     150 and Thunderbird 150 (CVE-2026-6786)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)

    * firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)

    * firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)

    * firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D     component (CVE-2026-6749)

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766)

    * firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)

    * firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)

    * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird     ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)

    * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)

    * firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component     (CVE-2026-6764)

    * firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)

    * firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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 115.35. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-31 advisory.

  - Integer overflow in the Libraries component in NSS. This vulnerability was fixed in Firefox 148, Firefox     ESR 140.8, Thunderbird 148, and Thunderbird 140.8. (CVE-2026-2781)

  - Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149     and Thunderbird 149. 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-2026-6785)

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

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6225 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6225-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     April 22, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : firefox-esr     CVE ID         : CVE-2026-6746 CVE-2026-6747 CVE-2026-6748 CVE-2026-6749                      CVE-2026-6750 CVE-2026-6751 CVE-2026-6752 CVE-2026-6753                      CVE-2026-6754 CVE-2026-6757 CVE-2026-6761 CVE-2026-6762                      CVE-2026-6763 CVE-2026-6764 CVE-2026-6765 CVE-2026-6766                      CVE-2026-6767 CVE-2026-6769 CVE-2026-6770 CVE-2026-6771                      CVE-2026-6772 CVE-2026-6776 CVE-2026-6785 CVE-2026-6786

    Multiple security issues have been found in the Mozilla Firefox web     browser, which could potentially result in the execution of arbitrary     code, spoofing, information disclosure or privilege escalation.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 140.10.0esr-1~deb12u1.

    For the stable distribution (trixie), these problems have been fixed in     version 140.10.0esr-1~deb13u1.

    We recommend that you upgrade your firefox-esr packages.

    For the detailed security status of firefox-esr please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/firefox-esr

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

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

The remote Debian 12 / 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6229 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6229-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     April 24, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : thunderbird     CVE ID         : CVE-2026-6746 CVE-2026-6747 CVE-2026-6748 CVE-2026-6749                      CVE-2026-6750 CVE-2026-6751 CVE-2026-6752 CVE-2026-6753                      CVE-2026-6754 CVE-2026-6757 CVE-2026-6761 CVE-2026-6762                      CVE-2026-6763 CVE-2026-6764 CVE-2026-6765 CVE-2026-6766                      CVE-2026-6767 CVE-2026-6769 CVE-2026-6770 CVE-2026-6771                      CVE-2026-6772 CVE-2026-6776 CVE-2026-6785 CVE-2026-6786

    Multiple security issues were discovered in Thunderbird, which could     result in the execution of arbitrary code.

    For the oldstable distribution (bookworm), these problems have been fixed     in version 1:140.10.0esr-1~deb12u1.

    For the stable distribution (trixie), these problems have been fixed in     version 1:140.10.0esr-1~deb13u1.

    We recommend that you upgrade your thunderbird packages.

    For the detailed security status of thunderbird please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/thunderbird

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

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 150.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-30 advisory.

  - Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149.
    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-2026-6786)

  - Memory safety bugs present in Firefox 149 and Thunderbird 149. 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-2026-6784)

  - Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149     and Thunderbird 149. 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-2026-6785)

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

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:10757 advisory.

    Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and     portability.

    Security Fix(es):

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6772)

    * firefox: thunderbird: Use-after-free in the JavaScript Engine component (CVE-2026-6754)

    * firefox: thunderbird: Spoofing issue in the DOM: Core & HTML component (CVE-2026-6762)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6752)

    * firefox: thunderbird: Other issue in the Storage: IndexedDB component (CVE-2026-6770)

    * firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-6757)

    * firefox: thunderbird: Other issue in the Libraries component in NSS (CVE-2026-6767)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird ESR 140.10, Firefox     150 and Thunderbird 150 (CVE-2026-6786)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC component (CVE-2026-6753)

    * firefox: thunderbird: Use-after-free in the Widget: Cocoa component (CVE-2026-6759)

    * firefox: thunderbird: Use-after-free in the WebRTC component (CVE-2026-6747)

    * firefox: thunderbird: Information disclosure due to uninitialized memory in the Graphics: Canvas2D     component (CVE-2026-6749)

    * firefox: thunderbird: Incorrect boundary conditions in the Libraries component in NSS (CVE-2026-6766)

    * firefox: thunderbird: Privilege escalation in the Networking component (CVE-2026-6761)

    * firefox: thunderbird: Mitigation bypass in the File Handling component (CVE-2026-6763)

    * firefox: thunderbird: Privilege escalation in the Graphics: WebRender component (CVE-2026-6750)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6748)

    * firefox: thunderbird: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird     ESR 140.10, Firefox 150 and Thunderbird 150 (CVE-2026-6785)

    * firefox: thunderbird: Mitigation bypass in the DOM: Security component (CVE-2026-6771)

    * firefox: thunderbird: Incorrect boundary conditions in the DOM: Device Interfaces component     (CVE-2026-6764)

    * firefox: thunderbird: Information disclosure in the Form Autofill component (CVE-2026-6765)

    * firefox: thunderbird: Privilege escalation in the Debugger component (CVE-2026-6769)

    * firefox: thunderbird: Uninitialized memory in the Audio/Video: Web Codecs component (CVE-2026-6751)

    * firefox: thunderbird: Incorrect boundary conditions in the WebRTC: Networking component (CVE-2026-6776)

    * firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-6746)

    For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and     other related information, refer to the CVE page(s) listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

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

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

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

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

The version of Firefox ESR installed on the remote Windows host is prior to 140.10. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-32 advisory.

  - Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149.
    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-2026-6786)

  - Memory safety bugs present in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149     and Thunderbird 149. 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-2026-6785)

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 mozilla-firefox installed on the remote host is prior to 140.10.0esr. It is, therefore, affected by multiple vulnerabilities as referenced in the SSA:2026-111-02 advisory.

    New mozilla-firefox packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the mozilla-firefox security advisory.

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 Windows host is prior to 140.10. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-34 advisory.

  - Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR     140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6771)

  - Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 150, Firefox ESR     115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6746)

  - Use-after-free in the WebRTC component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10,     Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6747)

  - Uninitialized memory in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox     150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10. (CVE-2026-6748, CVE-2026-6751)

  - Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability     was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
    (CVE-2026-6749)

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

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
307895	Mozilla Firefox < 150.0	Nessus	MacOS X Local Security Checks	2026/4/21	2026/4/27	medium
309098	Mozilla Thunderbird < 150.0	Nessus	MacOS X Local Security Checks	2026/4/21	2026/4/27	medium
310549	RHEL 8 : firefox (RHSA-2026:10766)	Nessus	Red Hat Local Security Checks	2026/4/27	2026/4/27	critical
309101	Mozilla Thunderbird < 140.10	Nessus	MacOS X Local Security Checks	2026/4/21	2026/4/24	critical
310350	Debian dla-4549 : thunderbird - security update	Nessus	Debian Local Security Checks	2026/4/26	2026/4/26	critical
309100	Mozilla Thunderbird < 150.0	Nessus	Windows	2026/4/21	2026/4/27	medium
310077	Fedora 44 : firefox / nss (2026-fb08ad61f2)	Nessus	Fedora Local Security Checks	2026/4/24	2026/4/24	medium
310550	RHEL 10 : firefox (RHSA-2026:10767)	Nessus	Red Hat Local Security Checks	2026/4/27	2026/4/27	critical
307896	Mozilla Firefox ESR < 115.35	Nessus	MacOS X Local Security Checks	2026/4/21	2026/4/21	critical
309199	Debian dsa-6225 : firefox-esr - security update	Nessus	Debian Local Security Checks	2026/4/22	2026/4/22	critical
310182	Debian dsa-6229 : thunderbird - security update	Nessus	Debian Local Security Checks	2026/4/24	2026/4/24	critical
307899	Mozilla Firefox < 150.0	Nessus	Windows	2026/4/21	2026/4/27	medium
310553	RHEL 9 : firefox (RHSA-2026:10757)	Nessus	Red Hat Local Security Checks	2026/4/27	2026/4/27	critical
309060	Linux Distros Unpatched Vulnerability : CVE-2026-6746	Nessus	Misc.	2026/4/21	2026/4/27	high
307894	Mozilla Firefox ESR < 140.10	Nessus	Windows	2026/4/21	2026/4/23	critical
309144	Slackware Linux 15.0 / current mozilla-firefox Multiple Vulnerabilities (SSA:2026-111-02)	Nessus	Slackware Local Security Checks	2026/4/22	2026/4/22	critical
309099	Mozilla Thunderbird < 140.10	Nessus	Windows	2026/4/21	2026/4/24	critical

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critical

medium

critical

high

critical

critical

critical