CVE-2026-95609 in Media Library Assistant Plugin
Summary
by MITRE • 10/09/2026
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in David Lingren Media LIbrary Assistant media-library-assistant allows Stored XSS.This issue affects Media LIbrary Assistant: from n/a through 3.41.
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Analysis
by VulDB Data Team • 10/09/2026
The identified security flaw represents a classic instance of Improper Neutralization of Input During Web Page Generation, commonly known as Cross-Site Scripting or XSS. Specifically, this vulnerability manifests as a Stored XSS within the David Lingren Media Library Assistant software, affecting versions ranging from n/a through 3.41. Unlike reflected XSS attacks where malicious scripts are executed via manipulated URLs, stored vulnerabilities involve the persistence of malicious input on the target server. In this context, an attacker can inject executable script code into data fields that are subsequently rendered by the application without proper sanitization or encoding. When other users access these compromised pages, their browsers execute the injected scripts in the security context of the vulnerable web application, leading to a severe compromise of user trust and system integrity.
The technical root cause lies in the failure of the Media Library Assistant to adequately validate or encode user-supplied input before including it in dynamically generated HTML content. This lack of proper neutralization allows special characters such as angle brackets, quotes, and ampersands to be interpreted as executable code rather than literal data. The persistence mechanism is particularly dangerous because the malicious payload remains active on the server until manually removed by an administrator or until the underlying record is deleted. This creates a persistent threat vector where every user viewing the affected media library entries becomes a potential victim of the attack, significantly amplifying the blast radius compared to transient vulnerabilities.
From an operational impact perspective, successful exploitation enables attackers to perform actions on behalf of authenticated users without their knowledge or consent. This can include stealing session cookies and authentication tokens, which may lead to complete account takeover if multi-factor authentication is not in place. Attackers can also manipulate page content, deface the application interface, redirect users to malicious phishing sites, or harvest sensitive information such as personal data stored within the media library entries. In environments where multiple administrators or contributors interact with the system, a single compromised entry could lead to widespread credential theft and lateral movement across connected systems if session tokens are reused elsewhere.
This vulnerability aligns directly with CWE-79, which defines Improper Neutralization of Input During Web Page Generation: Cross-site Scripting (XSS). Furthermore, in terms of tactical classification under the MITRE ATT&CK framework, this flaw facilitates techniques related to Client-Side Injection and potentially Credential Access via Browser Session Hijacking. The persistence aspect also touches upon Persistence mechanisms if the attacker uses the injected script to maintain access or exfiltrate data over time. Understanding these mappings is crucial for prioritizing remediation efforts within broader security frameworks that rely on standardized vulnerability classifications for risk assessment and patch management workflows.
Mitigation strategies must focus on implementing robust input validation and output encoding practices at both the application code level and infrastructure layer. Developers should ensure that all user-supplied data is strictly validated against a whitelist of expected characters before processing, rather than relying solely on blacklist approaches which are prone to bypasses. Crucially, when rendering this data in HTML contexts, it must be properly encoded using context-aware encoding techniques such as HTML entity encoding for text content or JavaScript string escaping if the data is embedded within script blocks. Additionally, implementing a Content Security Policy (CSP) header can significantly mitigate the impact of any successful XSS attempt by restricting the sources from which scripts are allowed to execute, thereby preventing the injection and running of unauthorized third-party code even if it manages to bypass input filters.