Stored Cross-Site Scripting in WP SEO Structured Data Schema Plugin by WordPress
CVE-2026-3604

4.9MEDIUM

Key Information:

Vendor

WordPress
Status
WP Seo Structured Data Schema
Vendor
CVE Published:
12 May 2026

What is CVE-2026-3604?

The WP SEO Structured Data Schema plugin for WordPress is prone to a Stored Cross-Site Scripting vulnerability via the _kcseo_ative_tab parameter. This issue arises from inadequate input sanitization and output escaping in all versions up to 2.8.1, potentially allowing authenticated attackers with Contributor-level access or higher to inject malicious scripts. These scripts can execute when users access affected pages, posing a significant security risk.

Affected Version(s)

WP SEO Structured Data Schema 0 <= 2.8.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/wp-seo-structu...
https://plugins.trac.wordpress.org/browser/wp-seo-structu...

CVSS V3.1

Score:
4.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Muhammad Yudha - DJ
.