An OS command injection vulnerability in FortiWeb's management interface 6.3.7 and below, 6.2.3 and below, 6.1.x, 6.0.x, 5.9.x may allow a remote authenticated attacker to execute arbitrary commands on the system via the SAML server configuration page.
https://github.com/1337or420/FortiGate-FortiWeb-Multi-Exploit-Extractor
https://github.com/murataydemir/CVE-2021-22123