Netgate pfSense Plus/pfSense CE prior 26.07/2.9.0 Firewall Rule Description /firewall_rules_edit.php descr cross site scripting

Summaryinfo

A vulnerability was found in Netgate pfSense Plus and pfSense CE and classified as problematic. This affects an unknown part of the file /firewall_rules_edit.php of the component Firewall Rule Description. Such manipulation of the argument descr leads to cross site scripting. This vulnerability is traded as CVE-2026-56127. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Netgate pfSense Plus and pfSense CE and classified as problematic. Affected by this issue is an unknown code of the file /firewall_rules_edit.php of the component Firewall Rule Description. The manipulation of the argument descr with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Rules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_rules_edit.php. The firewall rule description is stored in the pfSense XML configuration with only backslash-escaping applied and no HTML sanitization, then rendered without encoding in the firewall log table in /status_logs_filter.php. The payload executes in the browser of any user with the Status: Logs: Firewall privilege who views the affected log entries.

The advisory is shared for download at docs.netgate.com. This vulnerability is handled as CVE-2026-56127 since 06/18/2026. The exploitation is known to be easy. The attack may be launched remotely. Additional levels of successful authentication are needed for exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.007.

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

Upgrading to version 26.07 or 2.9.0 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Firewall Software

Vendor

• Netgate

Name

• pfSense CE
• pfSense Plus

License

• open-source

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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