CVE-2026-84393: Fortinet FortiOS

High severity, CVSS 8.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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>

Affected products

• Fortinet FortiOS: from 7.6.1, up to and including 7.6.6
• Fortinet FortiProxy: from 7.6.2, up to and including 7.6.6

Published 2026-09-08. Last modified 2026-09-10.