Detections
Analytics

Mozilla Thunderbird < 128.11.1

medium Nessus Plugin ID 238108

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Synopsis

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

Description

The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 128.11.1. It is, therefore, affected by a vulnerability as referenced in the mfsa2025-49 advisory.

 - A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. (CVE-2025-5986)

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

Solution

Upgrade to Mozilla Thunderbird version 128.11.1 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2025-49/

Plugin Details

Severity: Medium

ID: 238108

File Name: macos_thunderbird_128_11_1.nasl

Version: 1.3

Type: local

Agent: macosx

Published: 6/10/2025

Updated: 11/18/2025

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2025-5986

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

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: 6/10/2025

Vulnerability Publication Date: 6/10/2025

Reference Information

CVE: CVE-2025-5986

IAVA: 2025-A-0425