CVE-2025-64203: Everpress Mailster

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in EverPress Mailster mailster allows Reflected XSS.This issue affects Mailster: from n/a through < 4.1.14.

Affected products

• Everpress Mailster: up to and including 4.1.14

Published 2025-12-18. Last modified 2026-06-17.