Detections
Analytics

Mozilla Thunderbird < 140.7

high Nessus Plugin ID 284836

Synopsis

A mail client installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Thunderbird installed on the remote Windows host is prior to 140.7. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-05 advisory.

 - Spoofing issue in the Downloads Panel component. This vulnerability affects Firefox < 146, Thunderbird < 146, Firefox ESR < 140.7, and Thunderbird < 140.7. (CVE-2025-14327)

 - Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. (CVE-2026-0877)

 - Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
 (CVE-2026-0878)

 - Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
 (CVE-2026-0879)

 - Sandbox escape due to integer overflow in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7.
 (CVE-2026-0880)

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 140.7 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-05/

Plugin Details

Severity: High

ID: 284836

File Name: mozilla_thunderbird_140_7.nasl

Version: 1.1

Type: local

Agent: windows

Family: Windows

Published: 1/15/2026

Updated: 1/15/2026

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.9

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2025-14327

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: installed_sw/Mozilla Thunderbird

Exploit Ease: No known exploits are available

Patch Publication Date: 1/13/2026

Vulnerability Publication Date: 12/9/2025

Reference Information

CVE: CVE-2025-14327, CVE-2026-0877, CVE-2026-0878, CVE-2026-0879, CVE-2026-0880, CVE-2026-0882, CVE-2026-0883, CVE-2026-0884, CVE-2026-0885, CVE-2026-0886, CVE-2026-0887, CVE-2026-0890, CVE-2026-0891

IAVA: 2025-A-0895