Detections
Analytics

Mozilla Thunderbird < 153.5

critical Nessus Plugin ID 365351

Synopsis

A mail client installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.

Description

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 153.5. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-110 advisory.

 - Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109778)

 - Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109707)

 - A malicious, compromised, or MITM-controlled Exchange server can return a single well-formed SOAP response containing an element with enough attributes to keep Thunderbird's main thread CPU-bound for seconds to hours. (CVE-2026-110249)

 - Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109704)

 - Sandbox escape, site isolation issue due to incorrect boundary conditions, use-after-free in the Networking component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5. (CVE-2026-109705)

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

Solution

Upgrade to Mozilla Thunderbird version 153.5 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-110/

Plugin Details

Severity: Critical

ID: 365351

File Name: macos_thunderbird_153_5.nasl

Version: 1.1

Type: Local

Agent: macosx

Published: 10/13/2026

Updated: 10/13/2026

Supported Sensors: Frictionless Assessment AWS, Frictionless Assessment Azure, Frictionless Assessment Agent, Nessus Agent, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.06

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-109778

CVSS v3

Risk Factor: Critical

Base Score: 9.6

Temporal Score: 8.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-109707

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: installed_sw/Mozilla Thunderbird

Exploit Ease: No known exploits are available

Patch Publication Date: 10/13/2026

Vulnerability Publication Date: 10/13/2026

Reference Information

CVE: CVE-2026-109704, CVE-2026-109705, CVE-2026-109706, CVE-2026-109707, CVE-2026-109708, CVE-2026-109709, CVE-2026-109710, CVE-2026-109711, CVE-2026-109712, CVE-2026-109713, CVE-2026-109715, CVE-2026-109716, CVE-2026-109717, CVE-2026-109718, CVE-2026-109719, CVE-2026-109720, CVE-2026-109721, CVE-2026-109722, CVE-2026-109723, CVE-2026-109724, CVE-2026-109725, CVE-2026-109726, CVE-2026-109727, CVE-2026-109728, CVE-2026-109729, CVE-2026-109730, CVE-2026-109731, CVE-2026-109732, CVE-2026-109733, CVE-2026-109734, CVE-2026-109736, CVE-2026-109737, CVE-2026-109738, CVE-2026-109740, CVE-2026-109741, CVE-2026-109742, CVE-2026-109743, CVE-2026-109744, CVE-2026-109745, CVE-2026-109751, CVE-2026-109752, CVE-2026-109753, CVE-2026-109754, CVE-2026-109756, CVE-2026-109757, CVE-2026-109759, CVE-2026-109760, CVE-2026-109762, CVE-2026-109763, CVE-2026-109764, CVE-2026-109765, CVE-2026-109766, CVE-2026-109767, CVE-2026-109770, CVE-2026-109775, CVE-2026-109776, CVE-2026-109777, CVE-2026-109778, CVE-2026-109781, CVE-2026-109782, CVE-2026-109783, CVE-2026-110249