Authorization Bypass Vulnerability in Fortinet FortiAuthenticator
CVE-2026-126251

9.1CRITICAL

Key Information:

Vendor

Fortinet
Status
Fortiauthenticator
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126251?

An incorrect authorization vulnerability exists in Fortinet's FortiAuthenticator, specifically targeting versions 8.0.0 through 8.0.3 and 6.6.0 through 6.6.10. This flaw allows unauthorized users to bypass authentication mechanisms, potentially granting them illicit access to sensitive systems and data. Administrators should apply the latest updates to mitigate the risks associated with this vulnerability.

Affected Version(s)

FortiAuthenticator 8.0.0 <= 8.0.3

FortiAuthenticator 6.6.0 <= 6.6.10

References

https://fortiguard.fortinet.com/psirt/FG-IR-26-265

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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