---
id: CVE-2026-14472
title: >-
  The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via kubio/copyright Block Content in all versions up to,
  and including, 2.8.4 due to insufficient input sanitization and output
  escaping
summary: >-
  The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored
  Cross-Site Scripting via kubio/copyright Block Content in all versions up to,
  and including, 2.8.4 due to insufficient input sanitization and output
  escaping. This ma…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: extendthemes
product: Kubio AI Page Builder
affected:
  - kubio_ai_page_builder <= 2.8.4
published: '2026-09-18'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T13:23:37.403'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-14472'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.2/build/block-library/blocks/copyright/index.php#L22
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.2/build/block-library/blocks/copyright/index.php#L38
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/kubio/tags/2.8.2/lib/src/Core/Blocks/BlockBase.php#L413
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3616537%40kubio&new=3616537%40kubio
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/89392f97-58c5-48db-b835-013ef493ca5e?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
epss: 0.00261
epssPercentile: 0.15927
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-18T11:28:52.169775Z'
ingestedAt: '2026-09-18T08:38:04.099Z'
---

## Overview

The Kubio AI Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via kubio/copyright Block Content in all versions up to, and including, 2.8.4 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. This bypasses both the WordPress core kses-on-save filter and the plugin's own wp_kses_post() call, because entity-encoded script tags are treated as inert text by kses but are decoded into live HTML by the subsequent html_entity_decode() call in CopyrightBlock::render_template().

## Remediation

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