# CVE-2026-8378: Frontend File Manager Plugin Stored XSS in file-rename endpoint

Source: https://junglewise.ai/threats/cve-2026-8378-frontend-file-manager-plugin-stored-xss-in-file-rename-endpoint  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-23. Updated: 2026-06-23  
License: CC BY 4.0 with a link back

CVE-2026-8378 · Severity: info · CVSS 8 · Published 2026-06-23

The Frontend File Manager plugin for WordPress, which allows users to upload and manage files from the website's frontend, contains a security flaw. An attacker with a basic user account can rename a file using malicious code that triggers when a site administrator views the file management dashboard. This could allow the attacker to hijack the administrator's session, potentially leading to a full takeover of the website.

Technologies: [Nmedia Frontend File Manager](https://junglewise.ai/threats/technologies/frontend-file-manager). Vendors: [Nmedia](https://junglewise.ai/threats/vendors/nmedia).

## Quick answers

**Is CVE-2026-8378 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-8378 being exploited in the wild.

**How severe is CVE-2026-8378?** Informational severity, with a CVSS score of 8, published 23 June 2026.

**Which products and versions are affected?** Nmedia Frontend File Manager <= 23.6.

**Is there a fix for CVE-2026-8378?** 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-2026-8378 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-8378?** Check whether you run Nmedia Frontend File Manager 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

A Stored Cross-Site Scripting (XSS) vulnerability exists in the Frontend File Manager Plugin through version 23.6. The issue stems from a failure to sanitize or escape filenames submitted to the frontend file-rename endpoint before they are stored as post meta. When an administrator views the File Manager listing in the WordPress backend, the malicious payload is executed in their browser context. This vulnerability is exploitable by users with Subscriber-level access or higher. As of the advisory date, no official patch has been released.

## Affected products

- nmedia-user-file-uploader Frontend File Manager Plugin <= 23.6

## Timeline

- 2026-06-02: disclosed: Initial public disclosure by WPScan
- 2026-06-23: advisory: CVE published to NVD dataset

## References

- [https://wpscan.com/vulnerability/19f5dd94-b16c-4ad2-9586-d15ddecf9805/](https://wpscan.com/vulnerability/19f5dd94-b16c-4ad2-9586-d15ddecf9805/)

## Related threats

- [Frontend File Manager cross-site scripting (XSS)](https://junglewise.ai/threats/cve-2026-32577-unauthenticated-cross-site-scripting-xss-in-frontend-file-manager)
- [nMedia Frontend File Manager Plugin arbitrary post deletion](https://junglewise.ai/threats/cve-2026-8380-nmedia-frontend-file-manager-plugin-arbitrary-post-deletion)