Externally-Controlled Format String Vulnerability in Fortinet FortiAuthenticator
CVE-2026-126247

7.2HIGH

Key Information:

Vendor

Fortinet
Status
Fortiauthenticator
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126247?

The vulnerability in Fortinet FortiAuthenticator versions 8.0.0 to 8.0.3 and 6.6.0 to 6.6.10 involves the misuse of externally-controlled format strings. An authenticated attacker with privileged access may exploit this vulnerability by sending crafted HTTP requests, potentially executing unauthorized commands or code within the affected application, leading to significant security risks. It is imperative for users to apply the recommended updates and patches from Fortinet to mitigate potential threats.

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-26-261

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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