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Vulnerabilities

Vulnerability · CVE-2026-84393

ZTNA Portal Improper Certificate Validation

Published Sep 8, 2026 · catalog updated Oct 15, 2026 · Fortinet FortiOS

Check if you run it

No confirmed exploitation is on record for CVE-2026-84393. EPSS is 0.28%. Act only if a listed version of Fortinet FortiOS is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.28%
Remediation
Not established
Affected products
vendor Fortinet FortiOS · vendor Fortinet FortiProxy

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

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Fortinet FortiOSversion unspecified
  • vendor Fortinet FortiProxyversion unspecified

How to fix CVE-2026-84393

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-84393. EPSS is 0.28%. Act only if a listed version of Fortinet FortiOS is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-297. EPSS 0.28%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Fortinet security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 8, 2026 · NIST NVD

    Detected

    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

  2. Oct 15, 2026 · NIST NVD

    Updated

    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

Sources

  • CIRCL Vulnerability LookupVulnerability recordCVE-2026-84393

    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

    vulnerability.circl.lu
  • CVE.orgVulnerability recordCVE-2026-84393

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-84393

    30-day exploitation probability 0.3%

    first.org
  • Fortinet PSIRTVendor advisoryCVE-2026-84393

    CVE-2026-84393 is named in a Fortinet PSIRT advisory.

    filestore.fortinet.com
  • NIST NVDVulnerability recordCVE-2026-84393

    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

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.