Reflected Cross-Site Scripting Vulnerability in Netgate pfSense CE Firewall
CVE-2026-111233

2.3LOW

Key Information:

Vendor

Netgate

Status
Pfsense Ce
Vendor
CVE Published:
15 October 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-111233?

A reflected cross-site scripting vulnerability exists in the pfSense CE web interface, specifically within the firewall_rules.php script. This vulnerability enables remote attackers to execute arbitrary scripts by enticing users with elevated firewall rules privileges to click on a specially crafted GET link. If the non-default Require Firewall Interface option is enabled, a successful attack allows the malicious script to run within the user's web browser using their own privileges, potentially leading to unauthorized access or data manipulation.

Affected Version(s)

pfSense CE 2.7.1 <= 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-2026-111233 - Proof of Concept

References

https://github.com/abraxas/pfsense-rules-if-xss
exploittechnical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers
technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a...
technical-description

CVSS V4

Score:
2.3
Severity:
LOW
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abraxas Labs
.