CVE-2025-23703: Cstoltenkamp Free Mailclient FMC

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

Cross-Site Request Forgery (CSRF) vulnerability in cstoltenkamp Free MailClient FMC mailclient allows Stored XSS.This issue affects Free MailClient FMC: from n/a through <= 1.0.

Affected products

• Cstoltenkamp Free Mailclient FMC: up to and including 1.0

Published 2025-01-16. Last modified 2026-06-17.