CVE-2026-3604

FAUCET Score

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.

First published: May 12, 2026Last modified: May 12, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
Kcseopro	WP SEO Structured Data Schema	>= 0, <= 2.8.1CNA affecteddefault unaffected

CVSS Data

CVSS version used by this source: 3.1

4.9MEDIUM

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

LOW

Availability Impact

NONE

Exploitability Score

1.8

Impact Score

2.7

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.23%

Probability of exploitation in next 30 days

EPSS Percentile

13.8%

Percentile rank of EPSS score among Peer Group

As of 2026-07-27

Model: v2026.06.15

This CVE's current EPSS score of 0.0023 is in the 14th percentile among its peer group of 1,428 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

plugins.trac.wordpress.org / browser/wp-seo-structured-data-schema/tags/2.8.1/lib/classes/KcSeoMetaData.php

plugins.trac.wordpress.org / browser/wp-seo-structured-data-schema/trunk/lib/classes/KcSeoMetaData.php

wordfence.com / threat-intel/vulnerabilities/id/315fbc93-5af3-4fe9-b97a-a09957e54c97