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CVE Vulnerability Details :

CVE-2026-3604

PUBLISHED

More Info Official Page

Assigner-Wordfence

Assigner Org ID-b15e7b5b-3da4-40ae-a43c-f7aa60e62599

Published At-12 May, 2026 | 07:48

Updated At-12 May, 2026 | 07:48

▼CVE Numbering Authority (CNA)

WP SEO Structured Data Schema <= 2.8.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via '_kcseo_ative_tab' Parameter

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 Products

Vendor

kcseopro

Product

WP SEO Structured Data Schema

Default Status

unaffected

Versions

Affected

From 0 through 2.8.1 (semver)

Problem Types

Type	CWE ID	Description
CWE	CWE-79	CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Type: CWE

CWE ID: CWE-79

Description: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Metrics

Version	Base score	Base severity	Vector
3.1	4.9	MEDIUM	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Version: 3.1

Base score: 4.9

Base severity: MEDIUM

Vector:

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:N

Credits

finder

Muhammad Yudha - DJ

Timeline

Event	Date
Disclosed	2026-05-11 19:10:33

Event: Disclosed

Date: 2026-05-11 19:10:33

References

Hyperlink	Resource
https://www.wordfence.com/threat-intel/vulnerabilities/id/315fbc93-5af3-4fe9-b97a-a09957e54c97?source=cve	N/A
https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/lib/classes/KcSeoMetaData.php#L133	N/A
https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.8.1/lib/classes/KcSeoMetaData.php#L133	N/A
https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/trunk/lib/classes/KcSeoMetaData.php#L177	N/A
https://plugins.trac.wordpress.org/browser/wp-seo-structured-data-schema/tags/2.8.1/lib/classes/KcSeoMetaData.php#L177	N/A