The vulnerability CVE-2025-31591 affects the promoz73 Exit Popup Free plugin (version 1.0 and earlier) and is classified as a stored cross-site scripting (XSS) issue. It results from improper neutralization of input during web page generation, enabling attackers with high privileges and requiring user interaction to inject malicious scripts that persist and execute when other users access the affected content. The CVSS 3.1 base score is 5.9 (medium), reflecting network attack vector, low attack complexity, high privileges required, user interaction needed, and impacts on confidentiality, integrity, and availability at a low level. There is no vendor advisory or patch information available at this time.

Successful exploitation could allow an attacker with high privileges to inject malicious scripts that execute in the context of other users, potentially leading to limited disclosure of information, modification of data, or disruption of service. The impact is rated as medium severity with low confidentiality, integrity, and availability impacts. No known active exploitation has been reported.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should limit high-privilege access to the plugin and exercise caution with user-generated content. Monitor vendor channels for updates and apply patches promptly once released.