Description

Unauthenticated Cross Site Scripting (XSS) in Media LIbrary Assistant <= 3.38 versions.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.1",
  "pubDate": "2026-08-06T15:17:14.190Z",
  "pubdate": "2026-08-06T15:17:14.190Z",
  "executiveSummary": "An unauthenticated Cross-Site Scripting (XSS) vulnerability has been identified in the Media Library Assistant plugin, specifically affecting versions 3.38 and prior. This vulnerability permits unauthenticated threat actors to inject malicious scripts, typically JavaScript, into vulnerable input parameters processed by the application. When an unsuspecting user or administrative entity interacts with the compromised web interface, the injected payload executes within the context of their active browser session. The primary risk implication includes the potential hijacking of user sessions, unauthorized retrieval of sensitive data, and arbitrary modifications to the web application's state. Exploitation requires network access to the target WordPress instance, but does not necessitate prior authentication or elevated privileges, lowering the threshold for malicious engagement against vulnerable installations.",
  "technicalDetails": "The vulnerability stems from insufficient input sanitization and inadequate output encoding within the Media Library Assistant plugin for versions <= 3.38. Specifically, the vulnerable component fails to properly neutralize user-supplied input before reflecting it back within the Hypertext Markup Language (HTML) response generated by the application. This architectural oversight allows an attacker to bypass standard input validation routines and supply specially crafted strings containing malicious markup and script blocks.\nThe attack flow proceeds as follows: First, the unauthenticated attacker crafts a malicious Uniform Resource Locator (URL) or submits an HTTP request containing the Cross-Site Scripting payload targeted at a vulnerable endpoint managed by the Media Library Assistant plugin. Because the application lacks sufficient context-aware output encoding, it stores or immediately reflects the unvalidated payload within the Document Object Model (DOM) of the generated page. Second, the attacker induces a victim—such as a site administrator or standard user—to click the crafted link or visit the compromised page via social engineering or other delivery mechanisms. Finally, upon rendering the response, the victim's browser interprets the injected payload as legitimate application script and executes it with the permissions of the victim's session.\nThe root cause is directly attributable to missing or incomplete sanitization controls on input parameters processed by the plugin, alongside an absence of proper contextual escaping mechanisms during output generation. Since the vulnerability is unauthenticated and exposed via the network, any remote attacker can interact with the HTTP service to trigger the flaw. The behavior of the payload typically involves executing arbitrary JavaScript in the victim's browser context, enabling session token theft, DOM manipulation, forced redirection to malicious sites, or the execution of unauthorized administrative actions depending on the privilege level of the targeted user."
}