CVE-2026-6566
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
The NextGEN Gallery plugin for WordPress up to version 4.2.0 has an Insecure Direct Object Reference vulnerability in the image deletion REST API. Object-level authorization is missing – only 'NextGEN Manage gallery' permissions are checked, without gallery ownership verification. An authenticated attacker with Subscriber privileges and 'NextGEN Manage gallery' capability can delete other users' images and associated files from disk.
Risk Assessment
An attacker can delete other users' images, leading to data loss and potential content integrity compromise.
Recommendation
Update the NextGEN Gallery plugin to a version above 4.2.0 and review user permissions.
Other vulnerabilities in NextGEN Gallery
See all- CVE-2026-94123High
The NextGEN Gallery plugin in versions up to and including 4.5.0 contains an Arbitrary File Download vulnerability exploitable by an unauthenticated attacker. This allows downloading arbitrary files from the server.
- CVE-2026-9059Critical
SQL Injection vulnerability in NextGEN Gallery prior to version 4.2.1. An authenticated attacker with 'NextGEN Gallery overview' capability can inject arbitrary SQL into the ORDER BY clause via the 'orderby' parameter in REST API endpoints. Root cause is insufficient sanitization in '_clean_column()' using a blacklist approach.
- CVE-2026-76010High
The NextGEN Gallery plugin for WordPress (up to and including 4.4.1) is vulnerable to Remote Code Execution via the render_image function. This is due to unrestricted mass assignment of caller-supplied meta_data keys onto the image model, missing realpath containment in path construction, and a bypassable signature check on the public image delivery route. An authenticated attacker with custom-level access and above can execute code on the server.
- CVE-2026-116563Medium
The NextGEN Gallery plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 4.5.4 due to insufficient input sanitization and output escaping. This allows unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
- CVE-2026-28141High
Unauthenticated Cross Site Scripting (XSS) vulnerability in NextGEN Gallery versions up to 4.2.3. An attacker can inject malicious script without authentication.
Original NVD description (English source)
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).
Vulnerability data from NVD (NIST) · CISA KEV · EPSS