The WP Custom Post Popup plugin by gnanavelshenll suffers from a DOM-based Cross-site Scripting vulnerability due to improper input neutralization during web page generation. This vulnerability affects all versions up to 1.0.1. Exploitation requires network access, low attack complexity, low privileges, and user interaction, and can lead to partial compromise of confidentiality, integrity, and availability of the affected system or user session. The CVSS 3.1 base score is 6.5, indicating a medium severity level. No patch or vendor advisory is currently provided.

Successful exploitation of this vulnerability can allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to information disclosure, modification of data, or disruption of service. The impact affects confidentiality, integrity, and availability to a limited extent as indicated by the CVSS vector. 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 available, consider restricting access to the affected plugin or disabling it if feasible. Monitor for vendor updates regarding patches or mitigations specific to this vulnerability.