High [CVE-2026-84393] ZTNA Portal Improper Certificate Validation
This high-severity Fortinet advisory covers CVE-2026-84393 affecting FortiOS, FortiProxy.
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Summary
CVSSv3 Score:
7.3
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.
Revised on 2026-09-08 00:00:00
- FortiOS FortiOS: 7.2 through 8.0 (vendor-listed versions)
- FortiProxy FortiProxy: 7.2 through 8.0 (vendor-listed versions)
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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