The ConvertCalculator plugin for WordPress suffers from a stored XSS vulnerability (CWE-79) due to improper neutralization of input in the 'id' and 'type' parameters. This allows authenticated users with Contributor or higher privileges to inject arbitrary JavaScript code into pages generated by the plugin. When other users access these pages, the injected scripts execute in their browsers, potentially leading to session hijacking, privilege escalation, or other malicious actions. The vulnerability affects all versions up to and including 1.1.1. No known exploits are reported in the wild, and no patch or remediation guidance has been provided by the vendor as of the publication date.

An attacker with Contributor-level access or higher can exploit this vulnerability to inject persistent malicious scripts into pages generated by the plugin. This can lead to unauthorized actions performed in the context of other users viewing the infected pages, including theft of session tokens or other sensitive information. The vulnerability does not affect availability but impacts confidentiality and integrity. The CVSS 3.1 base score of 6.4 reflects a medium severity level 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 plugin if possible. Monitor plugin updates closely for any released patches addressing this vulnerability.