PT-2026-39946 · Kcseopro · Wp Seo Structured Data Schema

Published 2026-05-12 · Updated 2026-05-12 · CVE-2026-3604

NVD

CVSS v3.1

4.9

Medium

Base vector

AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-3604

Affected Products

Wp Seo Structured Data Schema

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-3604 · Security Note
• https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.8.1/lib/classes/KcSeoMetaData.php#L177 · Note
• https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/lib/classes/KcSeoMetaData.php#L177 · Note
• https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.8.1/lib/classes/KcSeoMetaData.php#L133 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/315fbc93-5af3-4fe9-b97a-a09957e54c97?source=cve · Note
• https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/lib/classes/KcSeoMetaData.php#L133 · Note