CVE-2026-120838 in All-in-One Video Gallery Plugin
Summary
by MITRE • 11/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Plugins360 Labs All-in-One Video Gallery all-in-one-video-gallery allows Stored XSS.This issue affects All-in-One Video Gallery: from n/a through 5.0.0.
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Analysis
by VulDB Data Team • 11/09/2026
The security flaw identified as a Cross-Site Scripting (XSS) vulnerability within the Plugins360 Labs All-in-One Video Gallery plugin, specifically affecting versions up to and including 5.0.0, represents a significant risk to web application integrity and user data confidentiality. This issue is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The core technical deficiency lies in the plugin's failure to adequately sanitize or encode user-supplied input before it is rendered within HTML contexts on the server side. Unlike reflected XSS where malicious scripts are executed immediately via a crafted URL, this vulnerability allows for Stored XSS, meaning that the injected script payload is persistently saved by the application and subsequently served to other users when they view the affected content. This persistence transforms the attack from a targeted incident into a widespread threat vector capable of compromising multiple victims without requiring further interaction with the attacker after the initial injection.
From an operational perspective, this vulnerability enables attackers to inject malicious JavaScript code that executes in the context of the victim's browser session while interacting with the vulnerable WordPress site. Because the payload is stored within the database or file system associated with the video gallery plugin, every user who accesses a page containing the compromised content will trigger the execution of the script. This can lead to severe consequences such as session hijacking, where attackers steal authentication cookies to impersonate legitimate users and administrators. It also facilitates credential theft through phishing pages that mimic login forms, defacement of the website by altering its visual presentation, and redirection of traffic to malicious domains hosting malware or ransomware. The impact is particularly acute in environments where multiple contributors upload content, as any user with sufficient permissions can introduce these payloads, making detection difficult for site administrators who may not immediately recognize the source of the injected code.
The attack vector aligns closely with MITRE ATT&CK technique T1059.007, which covers JavaScript execution within web browsers, and specifically relates to persistence mechanisms where malicious content is stored in a database or file system (T1505.003). The lack of proper output encoding allows the browser's parser to interpret the injected data as executable code rather than static text. This failure typically occurs when developers assume that input validation on entry points is sufficient, neglecting the critical step of escaping special characters such as quotes, ampersands, and angle brackets during the rendering phase. In the context of a video gallery plugin, this often involves fields like titles, descriptions, or metadata associated with uploaded videos where user input is directly embedded into HTML tags without sanitization.
To mitigate this vulnerability, immediate action must be taken by updating the All-in-One Video Gallery plugin to a version released after 5.0.0 that includes patches for these security flaws. If an update is not immediately available or feasible due to compatibility constraints, administrators should implement strict input validation and output encoding strategies within custom code overrides if permitted by the platform architecture. Utilizing Content Security Policy headers can also help mitigate the impact of successful XSS attacks by restricting the sources from which scripts are allowed to load, thereby preventing the execution of injected payloads even if they bypass other controls. Regular security audits and penetration testing focused on input handling in user-facing forms are essential for maintaining a robust defense posture against injection-based threats.