---
id: CVE-2026-19943
title: >-
  The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for
  WordPress is vulnerable to Stored Cross-Site Scripting via 'titleTag' Block
  Attribute in all versions up to, and including, 4.0.2 due to insufficient
  input sanitiza…
summary: >-
  The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for
  WordPress is vulnerable to Stored Cross-Site Scripting via 'titleTag' Block
  Attribute in all versions up to, and including, 4.0.2 due to insufficient
  input sanitiza…
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
published: '2026-08-25'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T15:10:00.207'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19943'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L28
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L80
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L28
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L80
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3662715%40gutenverse&new=3662715%40gutenverse
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/b7eb4cac-cf16-438e-81cc-516646e77cdc?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00195
epssPercentile: 0.08464
ingestedAt: '2026-10-12T15:55:08.150Z'
---

## Overview

The Gutenverse – WordPress Blocks, Page Builder & Site Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'titleTag' Block Attribute in all versions up to, and including, 4.0.2 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. The malicious titleTag value survives wp_kses_post on save because it is stored inside a block-comment delimiter and the live HTML is only synthesized at render time by do_blocks(), meaning the payload also fires in administrator and editor sessions during post preview.

## Remediation

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