CVE-2026-121528

HighCVSS 8.1/10Last modified Nov 14, 2026

Description

A improper certificate validation vulnerability in Fortinet FortiOS 7.6.0 through 7.6.4, FortiOS 7.4.0 through 7.4.9, FortiOS 7.2.0 through 7.2.13, FortiOS 7.0 all versions, FortiOS 6.4 all versions may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the SSLVPN web portal and the backend destination website.

Metrics

CVSS 3.1 8.1/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-295

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
Fortinet	FortiOS	>= 7.6.0, <= 7.6.4; >= 7.4.0, <= 7.4.9; >= 7.2.0, <= 7.2.13; >= 7.0.0, <= 7.0.19; >= 6.4.0, <= 6.4.16

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-193

Timeline

Published: Nov 11, 2026
Last modified: Nov 14, 2026
NVD status: Awaiting Analysis

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