Out-of-Bounds Write Vulnerability in Fortinet FortiAuthenticator Software
CVE-2026-126245

8.1HIGH

Key Information:

Vendor

Fortinet
Status
Fortiauthenticator
Vendor
CVE Published:
11 November 2026

What is CVE-2026-126245?

An out-of-bounds write vulnerability exists in Fortinet's FortiAuthenticator software, specifically in versions 8.0.0 through 8.0.3 and 6.6.0 through 6.6.10. This flaw may allow an unauthenticated attacker to execute unauthorized code or commands through crafted HTTP requests, especially if the attacker successfully bypasses Address Space Layout Randomization (ASLR) protections. Organizations using affected versions should apply security updates promptly to mitigate risks associated with potential exploitation.

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-26-259

CVSS V3.1

Score:
8.1
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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