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Fortinet FortiOS and FortiProxy Certificate Host-Mismatch Validation Flaw Exposes Sensitive Information to Network Interception

Last refreshed2026-09-29

Status: NEW  |  Advisory ID: CVE-2026-84393

Key Details

CVECVE-2026-84393
CVSS Score / Version8.1 (High) / CVSS v3.1
Updated2026-09-10
CVSS VectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Proseattack vector is network; attack complexity is high; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Classified asCWE-297 (Improper Validation of Certificate with Host Mismatch)

What to Know

A improper validation of certificate with host mismatch vulnerability in Fortinet FortiOS 7.6.1 through 7.6.6, FortiProxy 7.6.2 through 7.6.6 may allow attacker to information disclosure via <insert attack vector here>

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-84393
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-84393