CVE-2026-28141 in NextGEN Gallery Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Cross Site Scripting (XSS) in NextGEN Gallery <= 4.2.3 versions.
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Analysis
by VulDB Data Team • 08/06/2026
The vulnerability identified as unauthenticated cross site scripting in NextGEN Gallery plugin versions up to and including 4.2.3 represents a critical security flaw that allows attackers to execute malicious scripts in the context of affected websites without requiring authentication credentials. This type of vulnerability falls under the common weakness enumeration CWE-79 which specifically addresses improper neutralization of input during web page generation, commonly known as cross site scripting. The NextGEN Gallery plugin is widely used for managing and displaying image galleries on wordpress websites, making this vulnerability particularly dangerous as it can affect numerous websites that rely on this functionality.
The technical implementation of this XSS flaw occurs when the plugin fails to properly sanitize or escape user-supplied input before rendering it in web pages. Attackers can exploit this weakness by crafting malicious payloads that get executed when other users view gallery pages or administrative interfaces. The vulnerability typically manifests through parameters or input fields where users can upload images, add captions, or modify gallery configurations without proper validation mechanisms. These unfiltered inputs are then reflected back to users in the browser context, allowing attackers to inject malicious javascript code that can steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users.
The operational impact of this vulnerability extends beyond simple script execution as it creates a persistent threat vector for attackers seeking to compromise entire websites. When exploited successfully, attackers can manipulate gallery displays to include malicious scripts that target visitors' browsers, potentially leading to credential theft, session hijacking, or further exploitation through chained attacks. The unauthenticated nature of the flaw means that any visitor to the website can be affected without requiring login credentials, making it particularly attractive for mass exploitation campaigns. This vulnerability also aligns with attack techniques documented in the attack tree framework where attackers can leverage reflected xss as a stepping stone for more sophisticated attacks including privilege escalation or data exfiltration.
Mitigation strategies for this vulnerability should include immediate patching of the NextGEN Gallery plugin to versions that properly sanitize all user inputs and implement proper output encoding. Organizations should also consider implementing content security policies that restrict script execution within gallery contexts, employ web application firewalls that can detect and block malicious payloads, and conduct regular security audits of third party plugins. The remediation process should involve thorough input validation at multiple layers including client-side and server-side checks, proper escaping of dynamic content before rendering, and implementation of secure coding practices that prevent the reflection of user-supplied data without appropriate sanitization. Additionally, administrators should monitor their systems for signs of exploitation attempts and maintain up-to-date security monitoring tools to detect potential malicious activity related to this specific vulnerability.