CVE-2025-58596: Properfraction Mailoptin

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in properfraction MailOptin mailoptin allows Stored XSS.This issue affects MailOptin: from n/a through <= 1.2.75.0.

Affected products

• Properfraction Mailoptin: up to and including 1.2.75.0

Published 2025-09-03. Last modified 2026-06-17.