CVE-2026-67189 pfSense Plus/CE Stored XSS via Traffic Graphs PTR Record
Attackers can execute arbitrary JavaScript in admin browsers via unsanitized PTR records, leading to session hijacking and command execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-67189?
CVE-2026-67189 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-67189?
How do I fix CVE-2026-67189?
No fix has been published for CVE-2026-67189 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-67189 being exploited?
There is no known exploitation of CVE-2026-67189 in the wild and no public exploit code.
Sources
Also known as GHSA-gfrq-49j2-vmv3.