Gutenberg Blocks – PublishPress Blocks Controls, Visibility, Reusable Blocks <= 3.7.6 - Authenticated (Contributor+) Stored Cross-Site Scripting via Lightbox Data Attributes
- ID
- WPSEC-2026-3106
- Plugin
- PublishPress Blocks – Block Controls, Block Visibility, Block Permissions (advanced-gutenberg)
- Affected
- from 3.3.2 before 3.7.7
- Remediation
- Update to 3.7.7 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-13
- Attack surface
- Gutenberg Blocks – PublishPress Blocks Controls, Visibility, Reusable Blocks on WPSec AttackSurface
- Fix released
- Published
Description
The PublishPress Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'data-cbox-*' lightbox attributes in post content in all versions from 3.3.2 up to, and including, 3.7.6. This is due to insufficient input sanitization: WordPress allows data-* attributes in post content, and the bundled Colorbox library reads its options, such as 'html' and 'title' (and 'open', which opens the lightbox on page load), from these attributes on the plugin's lightbox elements and renders them as HTML. 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.
References
- https://wpsec.com/vuln/WPSEC-2026-3106/
- https://plugins.svn.wordpress.org/advanced-gutenberg/tags/3.7.7/
- https://wordpress.org/plugins/advanced-gutenberg/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
This advisory as JSON or Markdown · All advisories: JSON, RSS