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Mozilla Thunderbird < 147.0

🗓️ 15 Jan 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Thunderbird before 147.0 on Mac operating system has memory safety and sandbox escape vulnerabilities per mfsa2026-04.

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#%NASL_MIN_LEVEL 80900
## 
# (C) Tenable, Inc.
#                                  
# The descriptive text and package checks in this plugin were
# extracted from Mozilla Foundation Security Advisory mfsa2026-04.
# The text itself is copyright (C) Mozilla Foundation.
##

include('compat.inc');

if (description)
{
  script_id(284838);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/02/24");

  script_cve_id(
    "CVE-2026-0877",
    "CVE-2026-0878",
    "CVE-2026-0879",
    "CVE-2026-0880",
    "CVE-2026-0881",
    "CVE-2026-0882",
    "CVE-2026-0883",
    "CVE-2026-0884",
    "CVE-2026-0885",
    "CVE-2026-0886",
    "CVE-2026-0887",
    "CVE-2026-0888",
    "CVE-2026-0889",
    "CVE-2026-0890",
    "CVE-2026-0891",
    "CVE-2026-0892"
  );
  script_xref(name:"IAVA", value:"2026-A-0058-S");

  script_name(english:"Mozilla Thunderbird < 147.0");

  script_set_attribute(attribute:"synopsis", value:
"A mail client installed on the remote macOS or Mac OS X host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Thunderbird installed on the remote macOS or Mac OS X host is prior to 147.0. It is, therefore, affected
by multiple vulnerabilities as referenced in the mfsa2026-04 advisory.

  - Memory safety bugs present in Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of
    memory corruption and we presume that with enough effort some of these could have been exploited to run
    arbitrary code. (CVE-2026-0892)

  - Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird
    < 147. (CVE-2026-0881)

  - 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)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2026-04/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Thunderbird version 147.0 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2026-0892");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2026-0881");

  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/01/13");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/01/15");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:thunderbird");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_set_attribute(attribute:"stig_severity", value:"I");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"MacOS X Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("macosx_thunderbird_installed.nasl");
  script_require_keys("installed_sw/Mozilla Thunderbird");

  exit(0);
}

include('vdf.inc');

# @tvdl-content-verify-only
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "requires": [
    {
      "scope": "target",
      "match": {
        "os": "macos"
      }
    }
  ],
  "checks": [
    {
      "product": {
        "name": "Mozilla Thunderbird",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "fixed_version": "147.0"
        }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE);
vdf::handle_check_and_report_errors(vdf_result:vdf_result);

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24 Feb 2026 00:00Current
9High risk
Vulners AI Score9
CVSS 3.110
EPSS0.0055
SSVC
4