The MSTW League Manager plugin by Mark O'Donnell contains a CSRF vulnerability that enables stored XSS attacks. This affects all versions up to 2.10. The vulnerability allows attackers to trick authenticated users into executing unwanted actions, potentially injecting malicious scripts that persist in the application. The CVSS 3.1 vector indicates the attack can be performed remotely with low attack complexity, no privileges required, but requires user interaction. The impact includes partial confidentiality, integrity, and availability loss. No patch or official remediation guidance is currently provided.

Successful exploitation can lead to stored XSS, allowing attackers to execute malicious scripts in the context of authenticated users. This can compromise user data confidentiality, integrity, and availability to some extent. The CSRF aspect means attackers can induce users to perform unintended actions without their consent. No known exploits in the wild have been reported, but the vulnerability is rated high severity due to its potential impact.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or limiting use of the MSTW League Manager plugin, or implement CSRF protections such as verifying tokens on state-changing requests if possible. Monitor for vendor updates and apply patches promptly once released.