# Kadence Blocks <= 3.8.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Advanced Gallery Lightbox Link Attributes

- **ID:** WPSEC-2026-1560
- **Plugin:** Kadence Blocks — Page Builder Toolkit for Gutenberg Editor (`kadence-blocks`), https://wordpress.org/plugins/kadence-blocks/
- **Affected versions:** all versions before 3.8.0.2
- **Fixed in:** 3.8.0.2 (Update to 3.8.0.2 or later.)
- **Severity:** Medium 5.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin High, affected versions High (as of 2026-10-23)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/kadence-blocks
- **Fix released:** 2026-10-22
- **Published:** 2026-10-23
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1560/

## Description

The Kadence Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Advanced Gallery lightbox in all versions up to, and including, 3.8.0.1, due to the front-end gallery lightbox script passing the title, data-title, data-description, data-glightbox and other data-* attributes of gallery item links to GLightbox without sanitization or escaping, which 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 and opens the gallery lightbox.

## References

- https://wpsec.com/vuln/WPSEC-2026-1560/
- https://plugins.svn.wordpress.org/kadence-blocks/tags/3.8.0.2/
- https://wordpress.org/plugins/kadence-blocks/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1560/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.