CVE-2026-67189: pfSense Plus/CE Stored XSS via Traffic Graphs PTR Record
pfSense Plus before 26.07 and pfSense CE through 2.8.1 contain a stored cross-site scripting vulnerability in the Traffic Graphs top-talkers feature, where PTR records returned by reverse DNS lookups are incorporated without sanitization into AJAX responses and rendered as HTML through a DOM sink in the administrator interface. An attacker who controls a PTR record and generates sufficient traffic to appear as a top talker can execute arbitrary JavaScript in an administrator's browser, gaining access to the authenticated session context and same-origin access to the firewall management interface, enabling account creation and arbitrary OS command execution.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
pfSense Plusto a version that resolves this vulnerability.Fixed in 26.07 - Upgrade
Upgrade
pfSense CEto a version that resolves this vulnerability.Fixed in 2.8.1
Event History
Frequently Asked Questions
Who can exploit this issue?
An attacker must control a PTR record returned by reverse DNS and generate enough traffic to be listed as a top talker in Traffic Graphs. Exploitation also requires an administrator to view the affected interface, because the payload executes in that administrator's browser.
What access could an attacker gain after successful exploitation?
The attacker can execute arbitrary JavaScript in the administrator's authenticated session context and interact with the firewall management interface as the same origin. The described impact includes creating accounts and executing arbitrary OS commands.
Which installations are affected?
pfSense Plus versions before 26.07 are affected. pfSense CE versions through 2.8.1 are affected.