CVE-2026-9643
WP Meta SEO <= 4.5.18 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI in 404 Logging
Description
The WP Meta SEO plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting via the REQUEST_URI server variable in all versions up to, and including, 4.5.18. When the plugin's `wpmsTemplateRedirect()` hook detects a 404, it concatenates `$_SERVER['HTTP_HOST']` with the raw `$_SERVER['REQUEST_URI']` and inserts that value verbatim into the `wp_wpms_links.link_url` column via `$wpdb->insert()`. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute whenever an administrator views the plugin's 404 & Redirects admin page (`/wp-admin/admin.php?page=metaseo_broken_link`).
INFO
Published Date :
June 24, 2026, 5:33 a.m.
Last Modified :
June 24, 2026, 5:33 a.m.
Remotely Exploit :
No
Source :
Wordfence
Solution
- Update WP Meta SEO plugin to version 4.5.19 or later.
- Sanitize user input used in database queries.
- Validate data before inserting into the database.
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