# Kadence Blocks <= 3.8.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Count Up Block Prefix, Suffix and Separator

- **ID:** WPSEC-2026-1370
- **Plugin:** Kadence Blocks — Page Builder Toolkit for Gutenberg Editor (`kadence-blocks`), https://wordpress.org/plugins/kadence-blocks/
- **Affected versions:** all versions before 3.8.0.1
- **Fixed in:** 3.8.0.1 (Update to 3.8.0.1 or later.)
- **Severity:** Medium 6.4 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin High, affected versions High (as of 2026-10-21)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/kadence-blocks
- **Fix released:** 2026-10-19
- **Published:** 2026-10-21
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1370/

## Description

The Kadence Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the Count Up block's prefix, suffix, separator and decimal settings in all versions up to, and including, 3.8.0 due to insufficient output escaping in the front-end count-up script, which inserted these values into a screen-reader element via innerHTML and passed them unescaped to the CountUp library. 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-2026-1370/
- https://plugins.svn.wordpress.org/kadence-blocks/tags/3.8.0.1/
- https://wordpress.org/plugins/kadence-blocks/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1370/

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.