CVE-2026-15161 Ninja Forms - Excel Export <= 3.3.6 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'filter' Parameter

The Ninja Forms - Excel Export plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.3.6. This is due to the savefilter AJAX handler storing the raw $POST'filter' array into a WordPress option via updateoption without any capability check, nonce...