# CVE-2026-15653: ThemeIsle Visualizer Stored XSS in backend-title parameter

Source: https://junglewise.ai/threats/cve-2026-15653-themeisle-visualizer-stored-xss-in-backend-title-parameter  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-24. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-15653 · Severity: medium · CVSS 6.4 · Published 2026-07-24

The Visualizer plugin for WordPress, which is used to create and manage interactive tables and charts, contains a security flaw that allows users with contributor-level access or higher to inject malicious scripts into the website. These scripts will automatically run in the browser of any visitor who views the affected page. This could lead to unauthorized actions being performed on behalf of site administrators or the theft of sensitive session information.

Technologies: [Themeisle Visualizer – Tables & Charts Manager with Built-in AI Generator](https://junglewise.ai/threats/technologies/visualizer). Vendors: [Themeisle](https://junglewise.ai/threats/vendors/themeisle).

## Quick answers

**Is CVE-2026-15653 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15653 being exploited in the wild.

**How severe is CVE-2026-15653?** Medium severity, with a CVSS score of 6.4, published 24 July 2026.

**Which products and versions are affected?** Themeisle Visualizer – Tables & Charts Manager with Built-in AI Generator <= 4.0.5.

**Is there a fix for CVE-2026-15653?** 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-2026-15653 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-15653?** Check whether you run Themeisle Visualizer – Tables & Charts Manager with Built-in AI Generator 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 Visualizer plugin for WordPress is vulnerable to Stored Cross-Site Scripting (XSS) due to insufficient input sanitization and output escaping on the 'backend-title' parameter. This vulnerability exists in all versions up to and including 4.0.5. An authenticated attacker with at least contributor-level permissions can inject arbitrary web scripts into the database. These scripts are then executed in the security context of any user's browser who accesses the page where the malicious title is rendered. This is a stored XSS vulnerability (CWE-79) that can lead to session hijacking or unauthorized administrative actions.

## Affected products

- ThemeIsle Visualizer – Tables & Charts Manager with Built-in AI Generator <= 4.0.5

## Timeline

- 2026-07-24: disclosed
- 2026-07-24: advisory

## References

- [https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Module/Chart.php](https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Module/Chart.php)
- [https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Module/Chart.php](https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Module/Chart.php)
- [https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Render/Page/Data.php](https://plugins.trac.wordpress.org/browser/visualizer/tags/4.0.5/classes/Visualizer/Render/Page/Data.php)
- [https://plugins.trac.wordpress.org/changeset?reponame=&old=3619025%40visualizer&new=3619025%40visualizer](https://plugins.trac.wordpress.org/changeset?reponame=&old=3619025%40visualizer&new=3619025%40visualizer)
- [https://www.wordfence.com/threat-intel/vulnerabilities/id/914554fd-1525-4925-bce4-2df4a8df5dbf?source=cve](https://www.wordfence.com/threat-intel/vulnerabilities/id/914554fd-1525-4925-bce4-2df4a8df5dbf?source=cve)

## Related threats

- [ThemeIsle Visualizer authorization bypass in REST API](https://junglewise.ai/threats/cve-2026-13468-themeisle-visualizer-authorization-bypass-in-rest-api)