Netgate pfSense CE up to 2.9.0 WebGUI firewall_rules.php if cross site scripting

Summaryinfo

A vulnerability has been found in Netgate pfSense CE up to 2.9.0 and classified as problematic. Affected by this vulnerability is an unknown functionality of the file firewall_rules.php of the component WebGUI. This manipulation of the argument if causes cross site scripting. This vulnerability is handled as CVE-2026-111233. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Netgate pfSense CE up to 2.9.0 and classified as problematic. Affected by this vulnerability is an unknown part of the file firewall_rules.php of the component WebGUI. The manipulation of the argument if with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-111233 since 10/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:firewall_rules.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Netgate

Name

• pfSense CE

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9.0

License

• open-source

CPE 2.3info

• 🔒
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CPE 2.2info

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