WP SEO Structured Data Schema, CVE-2026-3604

CVE, Research URL: CVE-2026-3604
Home page URL: Security reports for WP SEO Structured Data Schema
Application: WP SEO Structured Data Schema
Published on: May 12, 2026
Research Description: The WP SEO Structured Data Schema plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `_kcseo_ative_tab` parameter in all versions up to, and including, 2.8.1 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Affected versions: max 2.8.1.
Status: vulnerable