The MicroPayments – Fans Paysite: Paid Creator Subscriptions, Digital Assets, Tokens Wallet plugin for WordPress suffers from a stored cross-site scripting vulnerability due to improper neutralization of input during web page generation (CWE-79). Specifically, the 'videowhisper_content_upload_guest' shortcode does not properly sanitize or escape user-supplied attributes, enabling authenticated contributors or higher to inject arbitrary web scripts. These scripts persist and execute in the context of any user accessing the injected page, potentially leading to session hijacking or other client-side impacts. The vulnerability affects all versions up to and including 2.9.29. There is no indication of known exploits in the wild or an available patch at this time.

An attacker with contributor-level or higher privileges can inject persistent malicious scripts into pages via the vulnerable shortcode. This can lead to client-side impacts such as theft of user credentials, session tokens, or other sensitive information when other users view the compromised pages. The vulnerability does not affect availability but impacts confidentiality and integrity to a limited extent. The CVSS 3.1 base score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and no user interaction required.

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 removing the vulnerable shortcode if possible. Monitor vendor channels for updates and apply patches promptly once released.