CVE-2026-111226 Netgate pfSense CE 2.4.5 through 2.9.0 OS Command Injection via system_advanced_admin.php
Authenticated administrators can execute arbitrary root commands via OS command injection in pfSense CE Login Protection settings.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111226?
CVE-2026-111226 is a high-severity command injection vulnerability in Netgate pfSense CE, published on 15 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
pfSense CE 2.4.5 through 2.9.0 contains an OS command injection vulnerability that allows authenticated WebGUI users with Advanced Admin Access privilege to execute commands as root via Login Protection settings. Attackers can submit sshguard threshold, block time, or detection time values containing newlines or $(...) that are written unvalidated to sshguard.conf and sourced as root on restart.
Weakness: CWE-78
Which versions are affected by CVE-2026-111226?
How do I fix CVE-2026-111226?
No fix has been published for CVE-2026-111226 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-111226 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111226 exists.
Sources
Also known as GHSA-fm76-5wvr-6cv2.