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Mozilla Firefox < 148.0.2

🗓️ 10 Mar 2026 00:00:00Reported by TenableType 
nessus
 nessus
🔗 www.tenable.com

Firefox below 148.0.2 is vulnerable to mfsa2026-19: memory safety and policy bypass.

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Refs
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ATTACKERKB
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3 May 202623:59
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Rows per page
#%NASL_MIN_LEVEL 80900
## 
# (C) Tenable, Inc.
#                                  
# The descriptive text and package checks in this plugin were
# extracted from Mozilla Foundation Security Advisory mfsa2026-19.
# The text itself is copyright (C) Mozilla Foundation.
##

include('compat.inc');

if (description)
{
  script_id(301760);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/04/30");

  script_cve_id("CVE-2026-3845", "CVE-2026-3846", "CVE-2026-3847");
  script_xref(name:"IAVA", value:"2026-A-0234-S");

  script_name(english:"Mozilla Firefox < 148.0.2");

  script_set_attribute(attribute:"synopsis", value:
"A web browser installed on the remote Windows host is affected by multiple vulnerabilities.");
  script_set_attribute(attribute:"description", value:
"The version of Firefox installed on the remote Windows host is prior to 148.0.2. It is, therefore, affected by multiple
vulnerabilities as referenced in the mfsa2026-19 advisory.

  - Memory safety bugs present in Firefox 148.0.2. 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-2026-3847)

  - Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android. This vulnerability
    affects Firefox < 148.0.2. (CVE-2026-3845)

  - Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability affects Firefox
    < 148.0.2. (CVE-2026-3846)

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/mfsa2026-19/");
  script_set_attribute(attribute:"solution", value:
"Upgrade to Mozilla Firefox version 148.0.2 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  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:R/S:U/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-2026-3847");

  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:"2026/03/10");
  script_set_attribute(attribute:"patch_publication_date", value:"2026/03/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2026/03/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:mozilla:firefox");
  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:"Windows");

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

  script_dependencies("mozilla_org_installed.nasl");
  script_require_keys("installed_sw/Mozilla Firefox");

  exit(0);
}

include('vdf.inc');

# @tvdl-content-verify-only
var vuln_data = {
  "metadata": {
    "spec_version": "1.0"
  },
  "requires": [
    {
      "scope": "target",
      "match": {
        "os": "windows"
      }
    }
  ],
  "checks": [
    {
      "product": {
        "name": "Mozilla Firefox",
        "type": "app"
      },
      "check_algorithm": "default",
      "constraints": [
        {
          "fixed_version": "148.0.2"
        }
      ]
    }
  ]
};

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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30 Apr 2026 00:00Current
6.2Medium risk
Vulners AI Score6.2
CVSS 3.18.8
EPSS0.00056
SSVC
0