The KiwiChat NextClient plugin for WordPress suffers from a stored cross-site scripting vulnerability due to improper neutralization of input in the 'url' parameter. This allows authenticated users with Contributor-level permissions or higher to inject arbitrary web scripts into pages. These scripts execute in the context of users who access the injected pages, potentially leading to information disclosure or session hijacking. The vulnerability affects all versions up to and including 6.2. No patch or official fix has been documented as of the publication date.

Successful exploitation enables an authenticated attacker with Contributor or higher privileges to inject malicious scripts that execute in other users' browsers when they view the compromised pages. This can lead to limited confidentiality and integrity impacts, such as theft of user credentials or manipulation of page content. Availability is not affected. There are no reports of active exploitation in the wild.

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 limiting use of the affected plugin. Monitor vendor channels for updates and apply patches promptly once released.