SB2026111119 - Missing authentication for critical function in FortiOS
Published: November 11, 2026
Security Bulletin ID
SB2026111119
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Missing authentication for critical function (CVE-ID: CVE-2026-126259)
CWE-ID: CWE-306 - Missing Authentication for Critical Function
CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote non-authenticated attacker to execute arbitrary code.
The vulnerability exists due to missing authentication for critical function via HA. An unauthenticated attacker with ha fgsp + standalone-config-sync, or autoscale can execute command as super admin via crafted HA packets.
Remediation
Install update from vendor's website.