Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

CVE-2026-111226Netgate pfSense CE 2.4.5 through 2.9.0 OS Command Injection via system_advanced_admin.php

High 7.2

In plain English

A high-severity OS command injection in pfSense CE from Netgate. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 6.5% (higher than 94% of all known vulnerabilities).

Severity (CVSS 3.1)7.2High

Exploit odds (30 days)6.5%top 6.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Netgate	pfSense CE	2.4.5 – through 2.9.0

Weakness: CWE-78 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/abraxas/pfsense-sshguard-crlf exploit, technical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/pfSense/include/www/system_advanced_admin.inc#L355-L381 technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/etc/inc/syslog.inc#L531-L563 technical-description
VulnCheck Advisory: Netgate pfSense CE 2.4.5 through 2.9.0 OS Command Injection via system_advanced_admin.php third-party-advisory