The UsersWP plugin for WordPress contains a stored cross-site scripting vulnerability (CWE-79) in its front-end login, user registration, profile, and members directory features. Specifically, the 'uwp_profile' and 'uwp_profile_header' shortcodes do not properly sanitize or escape user-supplied attributes, enabling authenticated users with contributor or higher privileges to inject arbitrary JavaScript code. This code executes in the context of other users viewing the injected pages, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all versions up to 1.2.42. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction needed, and impacts on confidentiality and integrity but not availability.

An attacker with contributor-level or higher access can inject malicious scripts into pages using the vulnerable shortcodes. These scripts execute in the browsers of users who view the compromised pages, potentially exposing sensitive information or enabling further attacks such as session hijacking. The impact is limited to confidentiality and integrity with no direct availability impact. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, it is recommended to restrict contributor-level access to trusted users only and monitor for suspicious activity related to the affected shortcodes. Avoid using the 'uwp_profile' and 'uwp_profile_header' shortcodes if possible. Follow the vendor's updates closely for an official patch or temporary mitigation.