Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.
- https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.
- https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/l
- https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/l
- https://www.wordfence.com/threat-intel/vulnerabilities/id/315fbc93-5af3-4fe9-b97
FAQ
What is CVE-2026-3604?
CVE-2026-3604 is a vulnerability with a CVSS score of 4.9 (MEDIUM). 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...
How severe is CVE-2026-3604?
CVE-2026-3604 has been rated MEDIUM with a CVSS base score of 4.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3604?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.