CVE-2026-113482 in Media Library Assistant Plugin
Summary
by MITRE • 11/01/2026
The Media Library Assistant WordPress plugin before 3.44 does not escape one of its shortcode attributes before outputting it in an attribute of generated links, allowing users with the Contributor role and above to perform Stored Cross-Site Scripting attacks.
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Analysis
by VulDB Data Team • 11/01/2026
The vulnerability identified in versions of the Media Library Assistant WordPress plugin prior to 3.44 represents a significant security flaw rooted in improper input validation and output encoding mechanisms. Specifically, the defect lies within the handling of shortcode attributes that are rendered into HTML link elements without adequate sanitization or escaping procedures. This architectural oversight allows malicious actors who possess at least Contributor-level privileges on the WordPress installation to inject executable JavaScript code directly into the application's content structure. The core technical failure is a classic case of insufficient output encoding, where user-supplied data derived from shortcode parameters is inserted into an HTML attribute context without being transformed into safe character entities or otherwise neutralized against script execution contexts.
From a technical perspective, this flaw enables Stored Cross-Site Scripting attacks, which are particularly dangerous because the malicious payload persists on the server-side database rather than existing solely in transient session data or URL parameters. When a user with Contributor privileges creates or edits media-related content using the affected shortcode, they can embed JavaScript code within one of the attribute values. Because the plugin fails to escape this input before rendering it as part of an HTML link's attributes, the browser interprets and executes the injected script whenever another user views that specific piece of content. This persistence mechanism ensures that every subsequent visit by any authenticated or unauthenticated visitor triggers the malicious payload, thereby amplifying the potential impact far beyond a single interaction.
The operational impact of this vulnerability is substantial due to its low privilege requirement for exploitation. In many WordPress environments, Contributor-level access is granted to multiple users who may not be fully trusted with administrative capabilities but are still considered part of the core content creation team. An attacker leveraging this flaw can execute arbitrary JavaScript in the context of other users' sessions. This capability allows for session hijacking through cookie theft, credential harvesting via phishing forms injected into the page DOM, or defacement of the website's appearance and functionality. Furthermore, if combined with other vulnerabilities such as cross-site request forgery weaknesses, an attacker could potentially escalate privileges to perform administrative actions on behalf of higher-privileged users, thereby compromising the entire web application infrastructure.
This vulnerability aligns closely with Common Weakness Enumeration identifier CWE-79, which classifies Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific vector involves stored persistence and attribute-based injection, highlighting a failure in both input validation and output encoding layers of the defense-in-depth strategy. In terms of threat modeling frameworks like MITRE ATT&CK, this behavior maps to techniques involving client-side code execution within web applications, often utilized for initial access or credential theft phases of an attack lifecycle. The lack of proper context-aware escaping means that even if input filtering is partially implemented, it may be bypassed through encoding tricks or attribute-specific injection points that were not explicitly secured by the developer.
To mitigate this risk and secure WordPress environments running affected versions of Media Library Assistant, immediate action must be taken to update the plugin to version 3.44 or later where these escaping mechanisms have been corrected. Administrators should verify their current installation status through the WordPress dashboard plugins section and apply updates promptly. For organizations unable to upgrade immediately due to compatibility constraints with other themes or plugins, temporary mitigation strategies include restricting Contributor-level access to only highly trusted individuals who do not require media management capabilities if such functionality is not strictly necessary for their role. Additionally implementing a Web Application Firewall can provide an additional layer of protection by detecting and blocking common XSS payloads in HTTP requests before they reach the application logic, although this should be viewed as a compensatory control rather than a permanent fix since it may introduce false positives or performance overhead.
Long-term resilience against such vulnerabilities requires adopting secure coding practices that prioritize output encoding based on context. Developers must ensure that all dynamic data inserted into HTML attributes is properly escaped using functions like htmlspecialchars with appropriate flags in PHP environments, ensuring special characters are converted to their entity equivalents before rendering. Regular security audits and code reviews focusing specifically on input/output handling paths can help identify similar flaws across the plugin ecosystem. Integrating static application security testing tools into the development pipeline further aids in detecting these issues early, reducing the window of exposure for end-users relying on third-party WordPress extensions for critical media management tasks.