FortiOS and FortiProxy ZTNA Validation Vulnerability Allows Attacker to Perform a Man-in-the-Middle Attack

Fortinet has disclosed a high-severity certificate validation flaw in the Agentless ZTNA portal of FortiOS and FortiProxy that could let an unauthenticated remote attacker intercept traffic flowing between the ZTNA portal and the backend destination website. Tracked as CVE-2026-84393 and documented under advisory FG-IR-26-174, the issue was published on September 8, 2026, and carries a […] The post FortiOS and FortiProxy ZTNA Validation Vulnerability Allows Attacker to Perform a Man-in-the-Middle Attack appeared first on Cyber Security News.

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