# Mixed Media Gallery Blocks <= 3.4.4 - Authenticated (Contributor+) Missing Authorization to Shared Media Tag Deletion

- **ID:** WPSEC-2026-0859
- **Plugin:** SimpLy Gallery (`simply-gallery-block`), https://wordpress.org/plugins/simply-gallery-block/
- **Affected versions:** all versions 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-2026-0859/

## Description

The SimpLy Gallery plugin for WordPress is vulnerable to unauthorized modification of data in all versions up to, and including, 3.4.4 due to insufficient capability checks when deleting tags from the shared tag storage via the 'update_tags_list' AJAX action and the media tags REST delete handler. The AJAX path only required the edit_posts capability and the REST path only required upload_files. This makes it possible for authenticated attackers, with Contributor-level access and above, to remove tags from the site-wide shared tag list used by other users.

## References

- https://wpsec.com/vuln/WPSEC-2026-0859/
- 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-2026-0859/

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.