# CVE-2026-18435: StellarWP Kadence Blocks stored XSS in toggleIcon attribute

Source: https://junglewise.ai/threats/cve-2026-18435-stellarwp-kadence-blocks-stored-xss-in-toggleicon-attribute  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-01. Updated: 2026-08-01  
License: CC BY 4.0 with a link back

CVE-2026-18435 · Severity: medium · CVSS 6.4 · Published 2026-08-01

Kadence Blocks is a popular WordPress plugin used to enhance the page-building experience. A security flaw allows users with basic contributor permissions to embed malicious scripts into website pages. When other users or administrators visit these pages, the scripts execute, potentially leading to unauthorized actions or data theft.

Technologies: [StellarWP Kadence Blocks — Page Builder Toolkit for Gutenberg Editor](https://junglewise.ai/threats/technologies/kadence-blocks). Vendors: [StellarWP](https://junglewise.ai/threats/vendors/stellarwp).

## Quick answers

**Is CVE-2026-18435 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-18435 being exploited in the wild.

**How severe is CVE-2026-18435?** Medium severity, with a CVSS score of 6.4, published 1 August 2026.

**Which products and versions are affected?** StellarWP Kadence Blocks — Page Builder Toolkit for Gutenberg Editor up to, and including, 3.7.8.

**Is there a fix for CVE-2026-18435?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-18435 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-18435?** Check whether you run StellarWP Kadence Blocks — Page Builder Toolkit for Gutenberg Editor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The Kadence Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'toggleIcon' block attribute. Authenticated attackers with contributor-level access or higher can exploit this by injecting arbitrary web scripts into a page via the block editor. These scripts are stored on the server and execute in the browser of any user who views the affected page. The vulnerability is present in all versions up to and including 3.7.8. A patch has been released in subsequent versions to address the sanitization failure.

## Affected products

- stellarwp Kadence Blocks — Page Builder Toolkit for Gutenberg Editor up to, and including, 3.7.8

## Timeline

- 2026-08-01: disclosed
- 2026-08-01: advisory

## References

- [https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/blocks/class-kadence-blocks-table-of-contents-block.php](https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/blocks/class-kadence-blocks-table-of-contents-block.php)
- [https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/class-kadence-blocks-table-of-contents.php](https://plugins.trac.wordpress.org/browser/kadence-blocks/tags/3.7.8/includes/class-kadence-blocks-table-of-contents.php)
- [https://plugins.trac.wordpress.org/changeset?reponame=&old=3624906%40kadence-blocks&new=3624906%40kadence-blocks](https://plugins.trac.wordpress.org/changeset?reponame=&old=3624906%40kadence-blocks&new=3624906%40kadence-blocks)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/5f346cc7-92ad-4f76-a71c-864c22ed56b5?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/5f346cc7-92ad-4f76-a71c-864c22ed56b5?source=cve)

## Related threats

- [StellarWP Kadence Blocks Stored XSS in Identity Block](https://junglewise.ai/threats/cve-2026-18062-stellarwp-kadence-blocks-stored-xss-in-identity-block)
- [Kadence WP Gutenberg Blocks unauthorized post publication in REST API](https://junglewise.ai/threats/cve-2026-15286-kadence-wp-gutenberg-blocks-unauthorized-post-publication-in-rest)
- [StellarWP Kadence Blocks authorization bypass in prebuilt library](https://junglewise.ai/threats/cve-2026-12902-stellarwp-kadence-blocks-authorization-bypass-in-prebuilt-library)
- [StellarWP Kadence Blocks authorization bypass in process_pattern REST API](https://junglewise.ai/threats/cve-2026-2826-stellarwp-kadence-blocks-authorization-bypass-in-process-pattern)