Live › vulnerability › CVE-2026-87111
Go to dashboardThe premium build of the User Registration PRO WordPress plugin stores attacker-supplied HTTP Referer header content without escaping, so it renders later as script in pages. An unauthenticated attacker can plant JavaScript that runs in the browser of any user who views the injected page, including administrators.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Sites running the premium build of User Registration PRO at version 6.2.9 or earlier. The free WordPress.org version is not affected, and the flaw is reachable by anyone because the nonce needed to call the vulnerable AJAX endpoint is exposed to anonymous visitors on every front-end page.
No product ranges from the sources yet.
wp plugin get user-registration --field=version or the plugin's header in wp-content/plugins/6.2.9 or lower6.2.9 as published by the vendor (fixed version number not stated in the sources)Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
The User Registration PRO – Custom Registration Form, Login Form, and User Profile WordPress Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via HTTP Referer Header in all versions up to, and including, 6.2.9 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. This vulnerability is present only in the premium build of the plugin and is not present in the free WordPress.org distribution. The nonce required to call the vulnerable AJAX endpoint is localized into the page source of every front-end page for anonymous visitors, making it fully obtainable by unauthenticated attackers.
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