The RegistrationMagic WordPress plugin suffers from a stored XSS vulnerability (CWE-79) via the 'payment_method' parameter due to improper input neutralization during web page generation. This allows authenticated users with low privileges (Subscriber and above) to inject arbitrary JavaScript code that executes in the context of other users viewing the injected content. The vulnerability affects all versions up to 6.0.4.3. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and impacts on confidentiality and integrity with no availability impact. No patch or vendor advisory is currently available, and the plugin is not a cloud service.

Successful exploitation allows an authenticated user with Subscriber-level access or higher to inject persistent malicious scripts into pages via the 'payment_method' parameter. This can lead to unauthorized actions performed in the context of other users, potentially compromising confidentiality and integrity of user data or session information. There is no reported impact on availability. No known exploits have been observed in the wild to date.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict user roles to trusted users only and consider disabling or limiting use of the vulnerable plugin. Monitor for updates from the vendor or security advisories for a patch or workaround.