Detections
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Mozilla Thunderbird < 156.0

high Nessus Plugin ID 346179

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 156.0. It is, therefore, affected by multiple vulnerabilities as referenced in the mfsa2026-94 advisory.

 - Privilege escalation in the Enterprise Policies component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, and Thunderbird 156. (CVE-2026-92073)

 - A maliciously constructed mail header could lead to multiple fields being parsed as one, or potential memory safety violations. (CVE-2026-92238)

 - A maliciously constructed IMAP line could cause an out-of-bounds buffer read. (CVE-2026-92239)

 - A malicious or compromised IMAP server can trigger an out-of-bounds read in the IMAP response parser by sending an untagged ' ID' response, crashing Thunderbird. The affected parsing path is reachable before authentication. (CVE-2026-92240)

 - Use-after-free in the Audio/Video: Web Codecs component. This vulnerability was fixed in Firefox 156, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 140.16. (CVE-2026-92005)

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 156.0 or later.

See Also

https://www.mozilla.org/en-US/security/advisories/mfsa2026-94/

Plugin Details

Severity: High

ID: 346179

File Name: mozilla_thunderbird_156_0.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 9/16/2026

Updated: 9/16/2026

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7

Percentile: 98.13

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-2026-92073

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/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: installed_sw/Mozilla Thunderbird

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2026

Vulnerability Publication Date: 9/15/2026

Reference Information

CVE: CVE-2026-92005, CVE-2026-92006, CVE-2026-92007, CVE-2026-92008, CVE-2026-92009, CVE-2026-92010, CVE-2026-92011, CVE-2026-92012, CVE-2026-92013, CVE-2026-92015, CVE-2026-92016, CVE-2026-92017, CVE-2026-92018, CVE-2026-92019, CVE-2026-92020, CVE-2026-92022, CVE-2026-92023, CVE-2026-92024, CVE-2026-92025, CVE-2026-92026, CVE-2026-92027, CVE-2026-92028, CVE-2026-92029, CVE-2026-92030, CVE-2026-92031, CVE-2026-92032, CVE-2026-92034, CVE-2026-92035, CVE-2026-92036, CVE-2026-92037, CVE-2026-92038, CVE-2026-92039, CVE-2026-92040, CVE-2026-92041, CVE-2026-92042, CVE-2026-92043, CVE-2026-92044, CVE-2026-92045, CVE-2026-92046, CVE-2026-92047, CVE-2026-92048, CVE-2026-92049, CVE-2026-92050, CVE-2026-92051, CVE-2026-92052, CVE-2026-92053, CVE-2026-92054, CVE-2026-92055, CVE-2026-92056, CVE-2026-92057, CVE-2026-92058, CVE-2026-92059, CVE-2026-92060, CVE-2026-92061, CVE-2026-92062, CVE-2026-92063, CVE-2026-92064, CVE-2026-92065, CVE-2026-92066, CVE-2026-92067, CVE-2026-92068, CVE-2026-92069, CVE-2026-92070, CVE-2026-92071, CVE-2026-92072, CVE-2026-92073, CVE-2026-92074, CVE-2026-92075, CVE-2026-92076, CVE-2026-92077, CVE-2026-92078, CVE-2026-92079, CVE-2026-92238, CVE-2026-92239, CVE-2026-92240