CVE-2026-9278 Form Builder CP < 1.2.47 - Editor+ Stored XSS via form_structure
Authenticated editors can inject malicious scripts into form configurations, leading to stored XSS attacks against site visitors.
- 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-2026-9278?
CVE-2026-9278 is a medium-severity cross-site scripting vulnerability in Unknown Form Builder CP, published on 15 Jun 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
The Form Builder CP WordPress plugin before 1.2.47 does not properly sanitize a form configuration value before storing it and using it as part of a client-side script execution, allowing authenticated users with Editor-level access and above to perform Stored Cross-Site Scripting attacks against any visitor of a page rendering the affected form, even when the `unfiltered_html` capability is disallowed (e.g. in a multisite network).
Which versions are affected by CVE-2026-9278?
How do I fix CVE-2026-9278?
No fix has been published for CVE-2026-9278 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-2026-9278 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9278 exists.
Sources
Also known as GHSA-x9r5-r92q-89hf.