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Mozilla Thunderbird < 128.12

🗓️ 02 Jul 2025 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com👁 4 Views

Mozilla Thunderbird version prior to 128.12 has multiple vulnerabilities affecting macOS users.

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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 mfsa2025-55.
# The text itself is copyright (C) Mozilla Foundation.
##

include('compat.inc');

if (description)
{
  script_id(241213);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/01/21");

  script_cve_id(
    "CVE-2025-6424",
    "CVE-2025-6425",
    "CVE-2025-6426",
    "CVE-2025-6429",
    "CVE-2025-6430"
  );
  script_xref(name:"IAVA", value:"2025-A-0496-S");

  script_name(english:"Mozilla Thunderbird < 128.12");

  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 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.");
  script_set_attribute(attribute:"see_also", value:"https://www.mozilla.org/en-US/security/advisories/mfsa2025-55/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Thunderbird version 128.12 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:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-6426");
  script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2025-6424");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/06/24");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/06/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/07/02");

  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) 2025-2026 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": "128.12"
        }
      ]
    }
  ]
};

var vdf_result = vdf::check_and_report(vuln_data:vuln_data, severity:SECURITY_HOLE, flags:{"xss": "TRUE"});
vdf::handle_check_and_report_errors(vdf_result:vdf_result);

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21 Jan 2026 00:00Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.19.8
EPSS0.03057
SSVC
4