---
id: CVE-2026-85679
title: >-
  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
summary: >-
  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 poss…
severity: high
cvss: 7.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: extendify
product: Extendify
affected:
  - Extendify <= 3.1.6
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T06:17:11.577'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85679'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L29
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L37
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L62
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/app/Shared/Services/BlockStyleVariations.php#L75
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/extendify/tags/3.1.6/bootstrap.php#L112
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3688833/extendify/trunk/app/Shared/Services/BlockStyleVariations.php
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3688833%40extendify%2Ftags%2F3.2.0&old=3669317%40extendify%2Ftags%2F3.1.6
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/38024680-2d99-4af0-b805-6fd718a1d338?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T05:37:57.558Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.