Argument injection in FortiMail - CVE-2026-126166
Published: November 11, 2026
Vulnerability identifier: #VU165222
CSH Severity: Low
CVSS v4: 7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126166
CWE-ID: CWE-88
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote privileged user to #BASIC_IMPACT#.
The vulnerability exists due to argument injection or modification in a command. An authenticated remote attacker with domain admin or admin privileges can delete users of other tenant domains on a paired FortiAuthenticator, execute arbitrary code as root or arbitrary CLI commands, and read or write arbitrary files as root via crafted HTTP requests to the administrative interface.
Affected software
FortiMail
How to mitigate CVE-2026-126166
Install update from vendor's website.
FortiMail - addressed in versions 7.4.9, 7.6.7, 8.0.3