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9.8

FortiOS lets unauthenticated attacker run admin commands

CVE-2026-126259 · published today
Summary

Certain versions of FortiOS can be tricked into accepting special network packets without checking who sent them. This lets an outside attacker execute commands with full administrator rights, potentially taking control of the firewall. Apply the latest security updates from Fortinet or upgrade to a patched version as soon as possible.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
fortinet fortios 8.0.0
Original advisory text
A missing authentication for critical function vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow an unauthen...
A missing authentication for critical function vulnerability in Fortinet FortiOS 8.0.0, FortiOS 7.6.0 through 7.6.7, FortiOS 7.4.0 through 7.4.12, FortiOS 7.2.0 through 7.2.13 may allow an unauthenticated attacker with HA FGSP + standalone-config-sync, or autoscale to execute command as super admin via crafted HA packets.
References
Fix within
Internet-facing 3 days
Internal 60 days
  • Not known to be exploited
  • Can be exploited automatically (estimated)
  • Gives an attacker full control (estimated)
Severity
9.8 Critical
Type
CWE-306Missing Authentication for Critical Function
Timeline
Published11 Nov 2026
Updated11 Nov 2026
First seen11 Nov 2026
Sources
CVE-2026-126259 · NVD
CVE-2026-126259 · MITRE
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