Fortinet PSIRT Monthly Advisories — November 2026

Exploited 0

Confirmed exploited (CISA KEV, ENISA). "Zero-day" means exploitation was known by the patch day — install these first.

None of this release's vulnerabilities is known to be exploited so far.

Critical 2

• Critical 9.1
  CVE-2026-121529 A origin validation error vulnerability in Fortinet FortiClientMac 7.4.0 through 7.4.7, FortiClientWindows 7.4.0 through 7.4.7, FortiClientWindows 7.2.0 throug…
• Critical 9.0
  CVE-2026-126261 A improper authorization vulnerability in Fortinet FortiManager 8.0.0, FortiManager 7.6.0 through 7.6.7, FortiManager 7.4.0 through 7.4.5, FortiManager 7.2.0 t…

All vulnerabilities 5