Format string error in FortiAuthenticator - CVE-2026-126247
Published: November 11, 2026
Vulnerability identifier: #VU165119
CSH Severity: Low
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126247
CWE-ID: CWE-134
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to execute arbitrary code.
The vulnerability exists due to use of externally-controlled format string. An authenticated privileged attacker can execute unauthorized code or commands via http requests.
Affected software
FortiAuthenticator
How to mitigate CVE-2026-126247
Install update from vendor's website.
FortiAuthenticator - addressed in versions 6.6.11, 8.0.4