Detections
Analytics

Mozilla Thunderbird < 140.0

critical Nessus Plugin ID 241210

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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 140.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2025-54 advisory.

 - If a user visited a webpage with an invalid TLS certificate, and granted an exception, the webpage was able to provide a WebAuthn challenge that the user would be prompted to complete. This is in violation of the WebAuthN spec which requires a secure transport established without errors. (CVE-2025-6433)

 - 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)

 - 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)

 - An attacker was able to bypass the <code>connect-src</code> directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools.
 (CVE-2025-6427)

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 140.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-54/

Plugin Details

Severity: Critical

ID: 241210

File Name: macos_thunderbird_140_0.nasl

Version: 1.2

Type: local

Agent: macosx

Published: 7/2/2025

Updated: 7/11/2025

Supported Sensors: 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-2025-6433

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

Vulnerability Information

CPE: cpe:/a:mozilla:thunderbird

Required KB Items: MacOSX/Thunderbird/Installed

Exploit Ease: No known exploits are available

Patch Publication Date: 7/2/2025

Vulnerability Publication Date: 6/24/2025

Reference Information

CVE: CVE-2025-6424, CVE-2025-6425, CVE-2025-6426, CVE-2025-6427, CVE-2025-6429, CVE-2025-6430, CVE-2025-6432, CVE-2025-6433, CVE-2025-6434, CVE-2025-6435, CVE-2025-6436

IAVA: 2025-A-0496