CVE-2026-56128 pfSense Plus < 26.07 / CE < 2.9.0 Stored XSS via firewall_schedule_edit.php
Authenticated users can inject JavaScript into firewall schedules, leading to XSS attacks against other administrators viewing the rules list.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-56128?
CVE-2026-56128 is a medium-severity cross-site scripting vulnerability in Netgate pfSense CE, published on 3 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
pfSense Plus before 26.07 and CE before 2.9.0 allow authenticated users with the Firewall: Schedules: Edit privilege to inject arbitrary JavaScript via the descr parameter in /firewall_schedule_edit.php. The schedule description is stored without HTML sanitization and subsequently inserted into an HTML attribute value in /firewall_rules.php with only single-quote escaping applied, permitting double-quote breakout. The payload executes in the browser of any user with the Firewall: Rules privilege who views the rules list with the affected schedule attached.
Weakness: CWE-79
Which versions are affected by CVE-2026-56128?
How do I fix CVE-2026-56128?
No fix has been published for CVE-2026-56128 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-2026-56128 being exploited?
There is no known exploitation of CVE-2026-56128 in the wild and no public exploit code.
Sources
Also known as GHSA-xqh2-9r6g-5jrx.