# Mixed Media Gallery Blocks <= 3.4.4 - Authenticated (Author+) Missing Authorization to Media Folder Modification and Deletion

- **ID:** WPSEC-2026-0858
- **Plugin:** SimpLy Gallery (`simply-gallery-block`), https://wordpress.org/plugins/simply-gallery-block/
- **Affected versions:** from 3.4.0 before 3.4.5
- **Fixed in:** 3.4.5 (Update to 3.4.5 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Medium, affected versions Medium (as of 2026-10-13)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/simply-gallery-block
- **Fix released:** 2026-10-12
- **Published:** 2026-10-13
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0858/

## Description

The SimpLy Gallery plugin for WordPress is vulnerable to unauthorized modification of data in versions 3.4.0 up to, and including, 3.4.4 due to missing object-level ownership and capability checks on media folders. The folder update and delete REST handlers (pgc-sgb/v1/media-folders), the folder membership assignment handler and the folder term meta auth callbacks only checked for the upload_files capability, and the folder taxonomy mapped its edit and delete term capabilities to upload_files as well. This makes it possible for authenticated attackers, with Author-level access and above, to rename, recolor, reorder or delete media folders created by other users and to change which media those folders contain. Deleting a folder also removes it from other users' attachments.

## References

- https://wpsec.com/vuln/WPSEC-2026-0858/
- https://plugins.svn.wordpress.org/simply-gallery-block/tags/3.4.5/
- https://wordpress.org/plugins/simply-gallery-block/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0858/

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.