High SEVERITY — Vulnerability

ZTNA Portal Improper Certificate Validation

CVSSv3 Score: 7.3 An improper certificate validation vulnerability in FortiOS and FortiProxy Agentless ZTNA portal may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the ZTNA portal and the backend destination website. Revised on 2026-09-08 00:00:00

Platform
FortiGate / FortiOS
CVSS Score
7.3/10
Advisory
FG-IR-26-174
Published
08 September 2026
Views
38
Primary source: Review the official advisory at fortiguard.fortinet.com Go to Source

Summary

CVSSv3 Score: 7.3 An improper certificate validation vulnerability in FortiOS and FortiProxy Agentless ZTNA portal may allow a remote and unauthenticated attacker to perform a Man-in-the-Middle attack on the communication channel between the ZTNA portal and the backend destination website. Revised on 2026-09-08 00:00:00

Source

FortiGate / FortiOS — Related Advisories

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