---
id: CVE-2026-84393
title: >-
  A improper validation of certificate with host mismatch vulnerability in
  Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow
  attacker to information disclosure via <insert attack vector here>
summary: >-
  A improper validation of certificate with host mismatch vulnerability in
  Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow
  attacker to information disclosure via <insert attack vector here>
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-297
vendor: Fortinet
product: FortiOS
affected:
  - FortiOS >= 7.6.1 <= 7.6.6
  - FortiProxy >= 7.6.2 <= 7.6.6
published: '2026-09-08'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T02:20:16.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84393'
references:
  - url: 'https://fortiguard.fortinet.com/psirt/FG-IR-26-174'
    label: psirt@fortinet.com
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-127084.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00278
epssPercentile: 0.20072
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T00:00:00+00:00'
scores:
  nvd: 8.1
  cna: 7.3
ingestedAt: '2026-09-08T19:08:49.602Z'
---

## Overview

A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.