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CVE-2026-19943

MEDIUM 6.4 CVSS 3.1
Published
August 25, 2026
Last modified
October 12, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Description

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.

Affected WordPress components

  • Gutenverse – WordPress Blocks, Page Builder & Site Editor Plugin · gutenverse
    Confirmed match Active
    Up to and including 4.0.2
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • jegstudio Gutenverse – WordPress Blocks, Page Builder & Site Editor — Up to and including 4.0.2

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L28
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.0/includes/block/class-chart.php#L80
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L28
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/gutenverse/tags/4.0.2/includes/block/class-chart.php#L80
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/changeset?reponame=&old=3662715%40gutenverse&new=3662715%40gutenverse
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/b7eb4cac-cf16-438e-81cc-516646e77cdc?source=cve
  • nvd.nist.gov Official NVD record