CVE-2024-3866

The Ninja Forms Contact Form plugin for WordPress is vulnerable to Reflected Self-Based Cross-Site Scripting via the 'Referer' header in all versions up to, and including, 3.8.15 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link. Successful exploitation of this vulnerability requires "maintenance mode" for a targeted form to be enabled. However, there is no setting available to the attacker or even an administrator-level user to enable this mode. The mode is only enabled during a required update, which is a very short window of time. Additionally, because of the self-based nature of this vulnerability, attackers would have to rely on additional techniques to execute a supplied payload in the context of targeted user.

We have discovered 35,460 live websites that are affected by CVE-2024-3866.

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Affected Software

Product	Ninja Forms
Category	Form Builders
Vulnerable Domains	35,460 live websites (27% of Ninja Forms install base)
Vulnerable Versions	from 0 through 3.8.15
Vulnerable Versions Count	195 versions ( 84% of all versions)