Vulnerability · Published Oct 15, 2026 · Assigned by VulnCheck

CVE-2026-111233Netgate pfSense CE 2.7.1 through 2.9.0 Reflected XSS via firewall_rules.php

Medium 4.7

In plain English

A medium-severity cross-site scripting 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 1.1% (higher than 65% of all known vulnerabilities).

Severity (CVSS 3.1)4.7Medium

Exploit odds (30 days)1.1%top 35.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Netgate pfSense CE 2.7.1 through 2.9.0 contains a reflected cross-site scripting vulnerability in firewall_rules.php that allows remote attackers to inject script via the unencoded if parameter. When the non-default Require Firewall Interface option is enabled, attackers can lure users with firewall rules privileges into opening a crafted GET link to execute script in the WebGUI with their privileges.

Affected products (as reported)

Vendor	Product	Versions
Netgate	pfSense CE	2.7.1 – through 2.9.0

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

References

https://github.com/abraxas/pfsense-rules-if-xss exploit, technical-description
https://abraxaslabs.tech/research/pfsense-ce-leftovers technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L138-L146 technical-description
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L391 technical-description
VulnCheck Advisory: Netgate pfSense CE 2.7.1 through 2.9.0 Reflected XSS via firewall_rules.php third-party-advisory