Medium severity · published Sep 3, 2026
CVE-2026-56127
pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_rules_edit.php
5.4
CVSS
1.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 64% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PC
pfSense CE · Netgate
before 2.9.0 · source: vendor
PP
pfSense Plus · Netgate
before 26.07 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56127
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56127
vendor-advisory
https://docs.netgate.com/downloads/pfSense-SA-26_10.webgui.asc
release-notes
https://docs.netgate.com/pfsense/en/latest/releases/26-07.html
release-notes
https://docs.netgate.com/pfsense/en/latest/releases/2-9-0.html
third-party-advisory
https://www.vulncheck.com/advisories/pfsense-plus-ce-stored-xss-via-firewall-rules-edit-php
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