Cross-site Scripting Vulnerability in MSTW League Manager by Mark O’Donnell
CVE-2026-34890

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
Mstw League Manager
Vendor
CVE Published:
2 April 2026

What is CVE-2026-34890?

A cross-site scripting (XSS) vulnerability has been identified in the MSTW League Manager plugin by Mark O'Donnell. This issue stems from the improper neutralization of user input during web page generation, particularly affecting DOM-based executions. Attackers could exploit this vulnerability to inject malicious scripts into webpages viewed by users, potentially compromising sensitive information, sessions, and user interactions. Affected versions include MSTW League Manager up to 2.10. It's important for users to implement appropriate security measures and updates to safeguard against these risks.

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Affected Version(s)

MSTW League Manager <= 2.10

References

https://patchstack.com/database/wordpress/plugin/mstw-lea...
vdb-entry

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Conor Sullivan | Patchstack Bug Bounty Program
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