Mozilla Thunderbird < 128.12

critical Nessus Plugin ID 241212

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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 128.12. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-55 advisory.

- The executable file warning did not warn users before opening files with the <code>terminal</code> extension. This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.
(CVE-2025-6426)

- A use-after-free in FontFaceSet resulted in a potentially exploitable crash. (CVE-2025-6424)

- An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. (CVE-2025-6425)

- Thunderbird could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an <code>embed</code> tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. (CVE-2025-6429)

- When a file download is specified via the <code>Content-Disposition</code> header, that directive would be ignored if the file was included via a <code><embed></code> or <code><object></code> tag, potentially making a website vulnerable to a cross-site scripting attack. (CVE-2025-6430)

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 128.12 or later.

Plugin Details

Severity: Critical

ID: 241212

File Name: mozilla_thunderbird_128_12.nasl

Version: 1.2

Type: local

Agent: windows

Family: Windows

Published: 7/2/2025

Updated: 7/11/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2025-6426

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

CVSS Score Source: CVE-2025-6424

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: Mozilla/Thunderbird/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 6/30/2025

Vulnerability Publication Date: 6/24/2025

Reference Information

CVE: CVE-2025-6424, CVE-2025-6425, CVE-2025-6426, CVE-2025-6429, CVE-2025-6430

IAVA: 2025-A-0496

Detections

Analytics