# Media Library Folders <= 8.4.3 - Authenticated (Author+) Insecure Direct Object Reference to Arbitrary Attachment Move/Copy

- **ID:** WPSEC-2026-2370
- **Plugin:** Media Library Folders (`media-library-plus`), https://wordpress.org/plugins/media-library-plus/
- **Affected versions:** all versions before 8.4.4
- **Fixed in:** 8.4.4 (Update to 8.4.4 or later.)
- **Severity:** Medium 6.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
- **Weakness:** CWE-639
- **Usage among sites WPSec scans:** plugin Low, affected versions None seen (as of 2026-11-03)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/media-library-plus
- **Fix released:** 2026-11-02
- **Published:** 2026-11-03
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2370/

## Description

The Media Library Folders plugin for WordPress is vulnerable to Insecure Direct Object Reference via the mlfp_process_mc_data AJAX action (move_copy_file function) in all versions up to, and including, 8.4.3, due to missing validation that the current user owns the attachments named in the user-controlled 'serial_copy_ids' key and missing validation of the destination 'folder_id'. This makes it possible for authenticated attackers, with Author-level access and above, to move or copy media files belonging to other users between folders, and to move protected files out of the protected directory.

## References

- https://wpsec.com/vuln/WPSEC-2026-2370/
- https://plugins.svn.wordpress.org/media-library-plus/tags/8.4.4/
- https://wordpress.org/plugins/media-library-plus/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2370/

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.