CVE-2026-65048

Ninja Forms plugin for WordPress versions 3.10.4 through 3.14.9 contains an unauthenticated stored cross-site scripting vulnerability in the Repeatable Fieldset feature where parseSubmissionIndex() accepts arbitrary strings as submission indexes without numeric validation, and admin_form_element() interpolates the index directly into HTML without escaping. An unauthenticated attacker can submit a public form with a crafted repeater child key containing malicious script payloads, which execute in an administrator's browser when viewing submissions in the WordPress admin panel, enabling session-cookie theft, creation of administrator accounts, installation of malicious plugins, and arbitrary modification of site content.

We have discovered 91,428 live websites that are affected by CVE-2026-65048.

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Affected Software

Product	Ninja Forms
Category	Form Builders
Vulnerable Domains	91,428 live websites (72% of Ninja Forms install base)
Vulnerable Versions	from 3.10.4 through 3.14.9
Vulnerable Versions Count	23 versions ( 9.66% of all versions)