The Shared Files – Frontend File Upload Form & Secure File Sharing plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, dfxp file uploads are not properly sanitized or escaped, enabling unauthenticated attackers to inject malicious scripts that execute when users access the affected dfxp files. This vulnerability affects all plugin versions up to 1.7.42 and is limited to Apache-based server environments where dfxp files are served by default. The CVSS 3.1 base score is 7.2, reflecting network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality and integrity.

Successful exploitation allows unauthenticated attackers to inject and execute arbitrary web scripts in the context of users viewing the dfxp files, potentially leading to theft of sensitive information, session hijacking, or other malicious actions impacting confidentiality and integrity. The vulnerability does not affect availability. It is limited to Apache-based environments handling dfxp files by default.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should consider restricting or disabling dfxp file uploads or serving, especially in Apache environments. Monitoring for suspicious activity related to dfxp file access may help detect exploitation attempts. Avoid exposing the vulnerable plugin on publicly accessible sites if possible.