The MDTF – Meta Data and Taxonomies Filter plugin for WordPress suffers from a stored XSS vulnerability due to improper neutralization of input during web page generation. Specifically, the 'mdf_results_by_ajax' shortcode does not adequately sanitize or escape user-supplied attributes, enabling authenticated attackers with contributor or higher privileges to inject arbitrary JavaScript. This script executes in the context of users accessing the compromised page, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to and including 1.3.3.6. No known exploits in the wild have been reported, and no patch or remediation details are currently available.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially compromising user sessions or performing unauthorized actions. The impact is limited to confidentiality and integrity (partial), with no direct availability impact. The vulnerability requires authenticated access, reducing the attack surface compared to unauthenticated XSS.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the MDTF plugin if feasible. Monitor official channels for updates or patches from the vendor realmag777.