The MSTW League Manager plugin by Mark O’Donnell contains a CWE-79 DOM-based Cross-site Scripting vulnerability that arises from improper neutralization of input during web page generation. This allows an attacker to inject malicious scripts that execute in the context of the victim's browser. The vulnerability affects all versions up to 2.10. The CVSS 3.1 vector indicates network attack vector, low attack complexity, requiring privileges and user interaction, with a scope change and low impact on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to limited disclosure of information, modification of data, or disruption of service. The impact is rated as medium severity with low confidentiality, integrity, and availability impacts. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or fix is currently documented, users should monitor for updates from the vendor. Until a fix is available, consider limiting user privileges and minimizing exposure to untrusted input where possible.