As of January 28 2026, Fortinet's Product Security Incident Response Team (PSIRT) has released several advisories addressing vulnerabilities in FortiOS. Below is a summary of the vulnerabilities listed, including their severity, affected versions, and recommended upgrade paths.
These vulnerabilities impact most FortiGate devices running FortiOS, including FortiGates, FortiSwitches, FortiAPs, as well as Forticlient installations on user machines.
Check Fortinet's PSIRT Advisories for further information and for any new vulnerabilities or updates related to FortiOS.
Upgrade Path: It's crucial to upgrade to the recommended FortiOS versions to mitigate these vulnerabilities. Ensure that you follow Fortinet's Upgrade Path Tool to determine the correct upgrade sequence for your specific FortiGate models, also please ensure you check feature changes when upgrading to FortiOS versions 7.4.9 or 7.6.x as there are features and options that fortinet have removed.