CVE-2026-116563
MediumCVSS 5.4Exploitation Probability (EPSS)
Low risk29th percentile - higher than 29% of all known CVEs
Summary
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.
Risk Assessment
An attacker could execute arbitrary JavaScript in the browsers of users visiting the affected page, potentially leading to session or data theft. However, exploitation requires the Shutter or Shutter Reloaded lightbox to be active and the injected comment to be approved through moderation.
Recommendation
Update the NextGEN Gallery plugin to a version later than 4.5.4. Additionally, consider switching the active lightbox away from Shutter/Shutter Reloaded and strictly moderate comments.
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-2026-28141High
Unauthenticated Cross Site Scripting (XSS) vulnerability in NextGEN Gallery versions up to 4.2.3. An attacker can inject malicious script without authentication.
- CVE-2026-6566Medium
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.
Original NVD description (English source)
The Photo Gallery, Sliders, Proofing and Themes – 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 makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Exploitation requires the site to have Shutter or Shutter Reloaded selected as the active lightbox, and the injected comment must be approved through WordPress's standard moderation workflow before the payload is rendered to other visitors.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS