PT-2026-29727 · Mark O'Donnell · Mstw League Manager

Conor Sullivan · Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-34890

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

Name of the Vulnerable Software and Affected Versions Mark O’Donnell MSTW League Manager versions through 2.10

Description Mark O’Donnell MSTW League Manager is susceptible to a DOM-Based Cross-Site Scripting (XSS) issue due to improper neutralization of input during web page generation. This allows for potential malicious code execution within the context of the user's browser.

Recommendations Update Mark O’Donnell MSTW League Manager to a version later than 2.10.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-34890

Affected Products

Mstw League Manager

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-34890 · Security Note
• https://twitter.com/CVEnew/status/2039744356874158175 · Twitter Post
• https://patchstack.com/database/wordpress/plugin/mstw-league-manager/vulnerability/wordpress-mstw-league-manager-plugin-2-10-cross-site-scripting-xss-vulnerability?_s_id=cve · Note