# Iptanus File Upload <= 5.2.3 - Unauthenticated Stored Cross-Site Scripting via File Upload HTML Content Detection Bypass

- **ID:** WPSEC-2026-3094
- **Plugin:** Iptanus File Upload (`wp-file-upload`), https://wordpress.org/plugins/wp-file-upload/
- **Affected versions:** all versions before 5.2.4
- **Fixed in:** 5.2.4 (Update to 5.2.4 or later.)
- **Severity:** High 7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N)
- **Weakness:** CWE-79
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-11-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-file-upload
- **Fix released:** 2026-11-12
- **Published:** 2026-11-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-3094/

## Description

The Iptanus File Upload plugin for WordPress is vulnerable to Stored Cross-Site Scripting via uploaded files in all versions up to, and including, 5.2.3 due to an insufficient HTML-content upload check. A file that begins with a vertical-tab character or with an incomplete HTML tag name (for example <bx>) bypasses the check, yet browsers still sniff and render it as HTML. This makes it possible for unauthenticated attackers, when an upload form is available to visitors, to upload files containing arbitrary web scripts that execute whenever a user accesses the uploaded file.

## References

- https://wpsec.com/vuln/WPSEC-2026-3094/
- https://plugins.svn.wordpress.org/wp-file-upload/tags/5.2.4/
- https://wordpress.org/plugins/wp-file-upload/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-3094/

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.