XSS in Extendify
CVE-2026-85679
The Extendify plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'styles.blocks' Block Type Key in all versions up to, and including, 3.1.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because registerIncoming() is hooked on rest_request_before_callbacks and runs before WordPress evaluates the route's permission_callback, meaning any unauthenticated POST, PUT, or PATCH request to a /wp/v2/global-styles route can trigger the vulnerable code path.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/38024680-2d99-4af0-b805-6fd71…
- plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/Blo…
- plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/Blo…
- plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/Blo…
- plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/Blo…
- plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/bootstrap.php
- plugins.trac.wordpress.org/changeset
- plugins.trac.wordpress.org/changeset/3688833/extendify/trunk/app/Shared/Service…
Frequently asked questions
- What is CVE-2026-85679?
- CVE-2026-85679 is a high-severity vulnerability in Extendify, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-10-01.
- How severe is CVE-2026-85679?
- High severity. CVSS v3 base score is 7.2 out of 10.