The Ultimate Post Kit Addons for Elementor plugin suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input in the 'url' parameter of the Social Count (Static) widget. This allows authenticated users with Contributor or higher privileges to inject arbitrary scripts that execute in the context of other users viewing the injected content. The vulnerability affects all versions up to and including 3.11.7. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring privileges, no user interaction, with scope changed and low impact on confidentiality and integrity, and no impact on availability.

An attacker with Contributor-level access or higher can inject persistent malicious scripts into pages via the vulnerable 'url' parameter. These scripts execute in the browsers of users who view the compromised pages, potentially leading to session hijacking, defacement, or other client-side attacks. The vulnerability does not impact availability and has low impact on confidentiality and integrity according to the CVSS score. There are no known exploits in the wild currently.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level access to trusted users only and consider disabling or removing the vulnerable Social Count (Static) widget if feasible. Monitor for updates from bdthemes regarding patches or official mitigations.