The Assistant for NextGEN Gallery plugin for WordPress is vulnerable to arbitrary directory deletion due to insufficient file path validation in the /wp-json/nextgenassistant/v1.0.0/control REST endpoint in all versions up to, and including, 1.0.9. This makes it possible for unauthenticated attackers to delete arbitrary directories on the server, which can cause a complete loss of availability.

The NextGEN Gallery WordPress plugin before 3.59.1 does not sanitise and escape some of its settings, which could allow high privilege users such as admin to perform Cross-Site Scripting attacks even when unfilteredhtml is disallowed

The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not verify that the user acting on an image owns the gallery it belongs to, allowing users granted its gallery-management capability by an administrator to delete, copy and re-tag any image on the site, including images in galleries belonging to other users.

The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not check that a user holds its options capability before saving image sizing settings, allowing users granted only its gallery-management capability by an administrator to change settings that apply across the whole site.

The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not correctly validate the extensions of files extracted from an uploaded archive, due to a variable being reused as a loop counter so that the check always passes, allowing users granted its gallery-management capability by an administrator to write arbitrary files into a web-accessible directory and, on hosts that execute them, run arbitrary code.

The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not verify that the requesting user is entitled to a given image record before returning it, allowing users with the Contributor role and above to read the stored metadata of any image on the site, including images in galleries belonging to other users. The disclosed data includes the image's stored EXIF subset, covering camera make and model and capture timestamp, along with internal checksums and identifiers that the Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0's own capability-gated read path reserves to administrators.

The Photo Gallery, Sliders, Proofing and WordPress plugin before 4.5.0 does not verify that the user saving a gallery owns it, allowing any user granted its gallery-management capability by an administrator to overwrite the stored settings of any gallery on the site, including its filesystem path, and including galleries belonging to other users.