Detections
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FreeBSD : Mozilla -- Mitigation bypass (785dfce9-4305-11f1-a627-b42e991fc52e)

medium Nessus Plugin ID 311053

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 785dfce9-4305-11f1-a627-b42e991fc52e advisory.

 https://bugzilla.mozilla.org/show_bug.cgi?id=2021666 reports:
 Mitigation bypass in the File Handling component.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

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

Solution

Update the affected packages.

See Also

https://cveawg.mitre.org/api/cve/CVE-2026-6763

http://www.nessus.org/u?43a6c90b

Plugin Details

Severity: Medium

ID: 311053

File Name: freebsd_pkg_785dfce9430511f1a627b42e991fc52e.nasl

Version: 1.1

Type: Local

Published: 4/29/2026

Updated: 4/29/2026

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.3

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-6763

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:firefox-esr, p-cpe:/a:freebsd:freebsd:thunderbird, cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:firefox

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 4/28/2026

Vulnerability Publication Date: 4/21/2026

Reference Information

CVE: CVE-2026-6763

IAVA: 2026-A-0388, 2026-A-0390