CVE-2026-84393

Improper Certificate Host Validation Allows Information Disclosure

Published Sep 8, 2026 CVSS 3.1 · 7.3 High EPSS < 1% KEV · Not listed
Description
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

Vendor Solution

Upgrade to FortiOS version 8.0.0 or above Upgrade to FortiOS version 7.6.7 or above Upgrade to upcoming FortiProxy version 8.0.0 or above Upgrade to upcoming FortiProxy version 7.6.7 or above Fortinet remediated this issue in FortiSASE version 26.2.2 (not released) and hence customers do not need to perform any action.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Title Improper Certificate Host Validation Allows Information Disclosure
Type Values Removed Values Added
Description 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>
First Time appeared Fortinet
Fortinet fortios
Fortinet fortiproxy
Weaknesses CWE-297
CPEs cpe:2.3:a:fortinet:fortiproxy:7.6.2:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiproxy:7.6.3:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiproxy:7.6.4:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiproxy:7.6.5:*:*:*:*:*:*:*
cpe:2.3:a:fortinet:fortiproxy:7.6.6:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.1:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.2:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.3:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.4:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.5:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.6.6:*:*:*:*:*:*:*
Vendors & Products Fortinet
Fortinet fortios
Fortinet fortiproxy
References
Metrics cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
fortinet
Published
Updated
Nov 10, 2026, 12:49 PM
Reserved
Sep 1, 2026, 4:36 PM
Status
Awaiting Analysis
Published
Sep 8, 2026, 5:18 PM
Modified
Oct 15, 2026, 2:20 AM