Netgate pfSense CE 2.7.1 through 2.9.0 Reflected XSS via firewall_rules.php

Advisories

Netgate pfSense CE 2.7.1 through 2.9.0 Reflected XSS via firewall_rules.php

Severity: low
Date: 10/15/2026
Affecting: pfSense CE >= 2.7.1, <= 2.9.0
CVE: CVE-2026-111233
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 2.3
CVSS V4 Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: https://github.com/abraxas/pfsense-rules-if-xss
https://abraxaslabs.tech/research/pfsense-ce-leftovers
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L138-L146
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f9/src/usr/local/www/firewall_rules.php#L391
Credit: Abraxas Labs
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.

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