The Themify Popup plugin (versions <= 1.4.2) suffers from a stored cross-site scripting vulnerability due to improper input neutralization during web page generation. This allows an attacker with low privileges to inject malicious scripts that execute when other users view the affected popup. The vulnerability has a CVSS 3.1 score of 6.5, reflecting a medium severity with network attack vector, low attack complexity, required privileges, and user interaction. No patch or vendor advisory is provided in the data, and no known exploits are reported.

Successful exploitation can lead to execution of arbitrary scripts in the context of users viewing the popup, potentially resulting in partial loss of confidentiality, integrity, and availability of affected users' data or sessions. The vulnerability requires user interaction and some privileges, limiting the ease of exploitation. 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, consider restricting access to the plugin or disabling it if feasible to reduce exposure. Monitor vendor channels for updates or patches addressing this vulnerability.