CVE-2026-6566: Smub Photo Gallery, Sliders, Proofing And Themes – NextGen Gallery

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The Photo Gallery, Sliders, Proofing and Themes – NextGEN Gallery plugin for WordPress is vulnerable to Insecure Direct Object Reference in versions up to and including 4.2.0. This is due to insufficient object-level authorization in the image deletion REST flow where the permission callback for DELETE /imagely/v1/images/{id} only checks 'NextGEN Manage gallery' permissions and does not enforce gallery ownership or 'NextGEN Manage others gallery' permissions. This makes it possible for authenticated attackers, with Subscriber-level privileges and 'NextGEN Manage gallery' capability, to delete gallery images belonging to other users as well as their associated image files from disk when deleteImg is enabled (default).

Affected products

• Smub Photo Gallery, Sliders, Proofing And Themes – NextGen Gallery: up to and including 4.2.0

Published 2026-05-20. Last modified 2026-07-24.