CVE-2026-86799 Forms < 3.0.2 - Unauthenticated Stored XSS via Form Submission
Unauthenticated attackers can inject scripts via form submissions that execute in administrators' browsers, potentially leading to account takeover.
- 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-2026-86799?
CVE-2026-86799 is a high-severity cross-site scripting vulnerability in Unknown Forms, published on 14 Oct 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
The Forms WordPress plugin before 3.0.2 does not sanitise submitted form values on storage, nor escape them before outputting them on the form submissions screen in the administration dashboard, allowing unauthenticated users to inject arbitrary web scripts that will execute in the browser of any administrator viewing the submissions.
Weakness: CWE-79
Which versions are affected by CVE-2026-86799?
How do I fix CVE-2026-86799?
No fix has been published for CVE-2026-86799 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-2026-86799 being exploited?
There is no known exploitation of CVE-2026-86799 in the wild and no public exploit code.
Sources
Also known as GHSA-mj4w-fwv4-27g5.