Live › vulnerability › CVE-2026-109997
Ninja Forms, a WordPress contact form plugin, fails to sanitize the formData.extra parameter, so anyone can store malicious scripts that run in the browser of whoever opens an affected page. The form submission endpoint also hands out valid nonces to any requester on failure, which removes the anti-forgery check and makes exploitation a single unauthenticated request.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-31 06:33 UTC. All times on this page are UTC.
Any WordPress site running Ninja Forms version 3.15.5 or earlier is exposed, since the form submission endpoint is reachable by unauthenticated visitors. Sites that do not run this plugin can skip it. The sources do not say whether non-default configuration changes exposure.
No product ranges from the sources yet.
wp plugin get ninja-forms --field=version.3.15.5 or earlier, which the sources say is affected.3.15.5; the sources do not name the exact fixed release.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
The Ninja Forms – Contact Form Builder with Calculators, Quizzes, Signatures & AI Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'formData.extra' parameter in all versions up to, and including, 3.15.5 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. The nf_ajax_submit endpoint issues a valid nonce to any requester on failure, effectively neutralizing the nonce check and making exploitation trivially achievable in a single unauthenticated request.
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