CVE-2025-40630: Icewarp Mail Server

Medium severity, CVSS 6.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Open redirection vulnerability in IceWarp Mail Server affecting version 11.4.0. This vulnerability allows an attacker to redirect a user to any domain by sending a malicious URL to the victim, for example “ https://icewarp.domain.com//<MALICIOUS_DOMAIN>/%2e%2e” https://icewarp.domain.com///%2e%2e” . This vulnerability has been tested in Firefox.

Affected products

• Icewarp Mail Server: version 11.4.0 only

Published 2025-05-16. Last modified 2026-06-17.