# CVE-2026-36521: PublicCMS stored XSS in site configuration management module

Source: https://junglewise.ai/threats/cve-2026-36521-publiccms-stored-xss-in-site-configuration-management-module  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-15. Updated: 2026-06-15  
License: CC BY 4.0 with a link back

CVE-2026-36521 · Severity: info · Published 2026-06-15

PublicCMS, a content management system, contains a security flaw in its site configuration settings. An attacker with access to the management console can insert malicious scripts into configuration descriptions. If another administrator views these settings, the script could execute in their browser, potentially leading to unauthorized actions or the theft of sensitive session information.

## Quick answers

**Is CVE-2026-36521 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-36521 being exploited in the wild.

**How severe is CVE-2026-36521?** Informational severity, published 15 June 2026.

**Which products and versions are affected?** PublicCMS PublicCMS V5.202506.d.

**Is there a fix for CVE-2026-36521?** 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-2026-36521 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-36521?** Check whether anything you run is named in the advisory. 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

A stored cross-site scripting (XSS) vulnerability exists in PublicCMS V5.202506.d within the site configuration management module. The vulnerability is located in the 'description' field when adding or modifying configuration items. An authenticated attacker with permissions to modify site settings can inject a malicious JavaScript payload into this field. The payload is executed when an administrative user navigates to the 'Modify Configuration Item' view for the affected entry. This can lead to session hijacking or unauthorized administrative actions within the context of the victim's browser.

## Affected products

- PublicCMS PublicCMS V5.202506.d

## Timeline

- 2026-06-15: disclosed: Initial disclosure via GitHub Gist and NVD publication.

## References

- [https://gist.github.com/xiaobai2207/f4f9d0c1a354a368cf5bcb02be152605](https://gist.github.com/xiaobai2207/f4f9d0c1a354a368cf5bcb02be152605)