Command Injection Vulnerability in pfSense CE Captive Portal by Netgate
CVE-2026-111229

8.6HIGH

Key Information:

Vendor

Netgate

Status
Pfsense Ce
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111229?

A command injection vulnerability exists in pfSense CE versions 2.7.0 through 2.9.0, impacting the Captive Portal functionality. Users with the Captive Portal HA privilege can exploit this flaw to execute arbitrary commands with root privileges. This vulnerability arises when an attacker manipulates the backwardsyncip variable to connect to a malicious XMLRPC server that injects shell metacharacters into the ip or mac fields. These unescaped characters are then passed to the pfctl shell command by the captiveportal_load_pfctl function, making it possible to execute unauthorized commands on the affected system.

Affected Version(s)

pfSense CE 2.7.0 <= 2.9.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-111229 - Proof of Concept

References

https://github.com/abraxas/pfsense-cp-ha-pfctl
exploittechnical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers
technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a...
technical-description

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abraxas Labs
.