CVE-2026-19769 Cross-site scripting in Ninja Forms – The Contact Form Builder That Grows With You
Unauthenticated attackers can inject arbitrary scripts via stored XSS in Ninja Forms, requiring the File Uploads add-on to be active.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19769?
CVE-2026-19769 is a high-severity cross-site scripting vulnerability in kstover Ninja Forms – The Contact Form Builder That Grows With You, published on 5 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The Ninja Forms – The Contact Form Builder That Grows With You plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Repeater Child 'type' Confusion via Unmatched Array Key in all versions up to, and including, 3.15.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the Ninja Forms File Uploads add-on to be active, as the attack routes the unwhitelisted child entry through the File Uploads handler to write an attacker-supplied HTML file containing arbitrary JavaScript into any web-server-writable directory, including the site root, where it is served from the site's own origin.
Weakness: CWE-79
Which versions are affected by CVE-2026-19769?
How do I fix CVE-2026-19769?
No fix has been published for CVE-2026-19769 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-2026-19769 being exploited?
There is no known exploitation of CVE-2026-19769 in the wild and no public exploit code.
Sources
Also known as GHSA-4g6m-8fw6-3c27.