CVE-2026-9643 WP Meta SEO <= 4.5.18 - Unauthenticated Stored Cross-Site Scripting via REQUEST_URI in 404 Logging

The WP Meta SEO plugin for WordPress is vulnerable to Unauthenticated Stored Cross-Site Scripting via the REQUESTURI server variable in all versions up to, and including, 4.5.18. When the plugin's wpmsTemplateRedirect hook detects a 404, it concatenates $SERVER'HTTPHOST' with the raw...