FortiOS & FortiProxy ZTNA Portal Improper Certificate Validation
Classification: Important, Solution: Official Fix, Exploit Maturity: Not Defined, CVSSv3.1: 7.3, CVEs: CVE-2026-84393, Summary: An improper certificate validation vulnerability [CWE-295] 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.
CVSS 7.3 CVE-2026-84393 Fortinet FI