# User Frontend <= 4.3.13 - Missing Authorization to Unauthenticated Arbitrary Attachment Creation via Upload Field

- **ID:** WPSEC-2026-1947
- **Plugin:** User Frontend – Membership, User Registration, User Profile, User Directory & Content Restriction with Frontend Post Submission (`wp-user-frontend`), https://wordpress.org/plugins/wp-user-frontend/
- **Affected versions:** all versions before 4.3.14
- **Fixed in:** 4.3.14 (Update to 4.3.14 or later.)
- **Severity:** Medium 5.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-29)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-user-frontend
- **Fix released:** 2026-10-28
- **Published:** 2026-10-29
- **URL:** https://wpsec.com/vuln/WPSEC-2026-1947/

## Description

The User Frontend plugin for WordPress is vulnerable to unauthorized file upload in all versions up to, and including, 4.3.13 due to the wpuf_upload_file AJAX handler not verifying that the target form actually contains a matching upload-capable field, trusting the client-supplied field type instead. This makes it possible for unauthenticated attackers, on forms that allow guest posting, to create attachments against forms that have no upload field.

## References

- https://wpsec.com/vuln/WPSEC-2026-1947/
- https://plugins.svn.wordpress.org/wp-user-frontend/tags/4.3.14/
- https://wordpress.org/plugins/wp-user-frontend/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-1947/

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.