The 'Kudos Donations – Easy donations and payments with Mollie' WordPress plugin suffers from a reflected cross-site scripting vulnerability due to the use of add_query_arg without proper escaping on URLs. This allows unauthenticated attackers to inject arbitrary web scripts that execute when a user clicks a maliciously crafted link. The vulnerability affects all versions up to and including 3.2.9. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, with low confidentiality and integrity impact and no availability impact.

Successful exploitation can lead to execution of arbitrary scripts in the context of the victim's browser session, potentially allowing theft of cookies, session tokens, or other sensitive information accessible to the browser. The vulnerability requires user interaction (clicking a crafted link) and does not grant direct system access or availability disruption. The impact is limited to confidentiality and integrity within the browser context.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, users should avoid clicking on suspicious links related to the plugin. Monitoring for updates from the plugin vendor is recommended to apply any forthcoming official fixes promptly.