CVE-2024-3866

Summary

CVE-2024-3866 is a Reflected Self-Based Cross-Site Scripting (XSS) vulnerability affecting the Ninja Forms Contact Form plugin for WordPress. This issue, present in all versions up to 3.8.15, stems from insufficient input sanitization and output escaping. Attackers can exploit this flaw by injecting arbitrary web scripts through the 'Referer' header. The exploit requires the targeted form to be in 'maintenance mode,' which is only enabled during updates, making it a narrow window of opportunity. Importantly, this mode cannot be activated by an attacker or even an administrator-level user. Since the XSS is self-based, successful payload execution relies on the attacker using additional techniques.

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