CVE-2026-118095 in Media Library Assistant Plugin
Summary
by MITRE • 10/29/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in David Lingren Media LIbrary Assistant media-library-assistant allows DOM-Based XSS.This issue affects Media LIbrary Assistant: from n/a through 3.42.
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Analysis
by VulDB Data Team • 10/29/2026
The identified security flaw represents a classic instance of Cross-Site Scripting, specifically categorized under the Common Weakness Enumeration identifier CWE-79 for Improper Neutralization of Input During Web Page Generation. This vulnerability is present in David Lingren Media Library Assistant versions ranging from n/a through 3.42 and manifests as a DOM-Based XSS attack vector rather than a traditional reflected or stored variant. In this architectural context, the malicious script execution occurs on the client side within the victim's browser environment, driven by untrusted data that is written to the Document Object Model without adequate sanitization or validation checks before rendering.
The technical mechanism behind this vulnerability typically involves JavaScript code reading input from a source such as document.location, window.name, or innerHTML and subsequently writing it to an output sink like document.write or eval without proper encoding. Because the flaw resides in the client-side processing logic of the web application's interface, attackers can craft malicious URLs containing embedded script payloads that are executed automatically when a user interacts with the compromised media library assistant interface. This bypasses server-side security controls since the injection point is located within the browser's rendering engine rather than on the backend infrastructure handling HTTP requests and database queries.
From an operational perspective, this vulnerability poses significant risks to both end-users and system administrators who utilize the Media Library Assistant plugin for managing digital assets. Successful exploitation allows threat actors to execute arbitrary JavaScript in the context of the affected website, which can lead to session hijacking through theft of authentication cookies or tokens stored locally by the browser. Attackers may also perform keylogging to capture sensitive credentials entered into forms within the application, redirect users to phishing sites designed to mimic legitimate login pages, or deface the user interface for reputational damage. Given that media management tools often handle high-value digital assets and administrative functions, compromising these sessions can provide unauthorized access to file systems, database configurations, and other critical backend resources if privilege escalation is possible through subsequent attacks.
This vulnerability aligns with several tactics within the MITRE ATT&CK framework, particularly those related to Client-Side Scripting Injection where adversaries leverage browser-based execution environments to bypass network perimeter defenses. The attack chain often involves initial access via social engineering or direct URL manipulation followed by credential harvesting and potential lateral movement if session tokens are exfiltrated and reused against other services protected by the same authentication mechanism. Defenders should recognize that DOM-Based XSS requires different mitigation strategies compared to server-side injections, focusing heavily on input validation at the JavaScript level rather than solely relying on web application firewalls which may not inspect dynamic client-side script execution paths effectively.
Mitigation efforts must prioritize immediate updates to version 3.42 or later where this issue has been addressed by developers through enhanced input sanitization and output encoding practices within the DOM manipulation routines. For environments unable to upgrade immediately, administrators should implement strict Content Security Policy headers that restrict inline script execution and define allowed sources for external resources, thereby limiting the impact of any injected payloads even if they are successfully rendered in the browser context. Additionally, enabling HTTP-only flags on session cookies can prevent client-side scripts from accessing sensitive authentication tokens, reducing the effectiveness of session hijacking attempts derived from this vulnerability. Regular security audits focusing on JavaScript code quality and adherence to OWASP guidelines for DOM-based XSS prevention will further harden the application against similar exploitation techniques in future versions or related plugins.