Kadence Blocks <= 3.8.0.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Legacy Advanced Button Video Lightbox URLs and Captions

ID

WPSEC-2026-1562

Plugin

Kadence Blocks — Page Builder Toolkit for Gutenberg Editor (kadence-blocks)

Affected

all versions before 3.8.0.2

Remediation

Update to 3.8.0.2 or later.

CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness

CWE-79

Usage

Plugin High · Affected versions High among sites WPSec scans, 2026-10-23

Attack surface

Kadence Blocks on WPSec AttackSurface

Fix released

2026-10-22

Published

2026-10-23

Description

The Kadence Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Simple Lightbox script used by the legacy Advanced Button video popup in all versions up to, and including, 3.8.0.1, due to the link URL and the caption (taken from the link's title attribute or a nearby figcaption) being concatenated into HTML and inserted via innerHTML without 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 and opens the lightbox.

References

• https://wpsec.com/vuln/WPSEC-2026-1562/
• https://plugins.svn.wordpress.org/kadence-blocks/tags/3.8.0.2/
• https://wordpress.org/plugins/kadence-blocks/

Published by WPSec. Provided as is, without warranty. Corrections: contact us.

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