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.
History

Sun, 17 May 2026 20:30:00 +0000

Type Values Removed Values Added
First Time appeared Kcseopro
Kcseopro wp Seo Structured Data Schema
Wordpress
Wordpress wordpress
Vendors & Products Kcseopro
Kcseopro wp Seo Structured Data Schema
Wordpress
Wordpress wordpress

Tue, 12 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 12 May 2026 08:30:00 +0000

Type Values Removed Values Added
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.
Title WP SEO Structured Data Schema <= 2.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via '_kcseo_ative_tab' Parameter
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published: 2026-05-12T07:48:19.050Z

Updated: 2026-05-12T12:45:06.844Z

Reserved: 2026-03-05T15:22:24.895Z

Link: CVE-2026-3604

cve-icon Vulnrichment

Updated: 2026-05-12T12:44:59.881Z

cve-icon NVD

Status : Deferred

Published: 2026-05-12T09:16:40.810

Modified: 2026-05-12T14:03:52.757

Link: CVE-2026-3604

cve-icon Redhat

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