CVE-2025-41255: Iterate GmbH Cyberduck

High severity, CVSS 8.0. EPSS: 0.2% chance of exploitation in the next 30 days.

Cyberduck and Mountain Duck improperly handle TLS certificate pinning for untrusted certificates (e.g., self-signed), unnecessarily installing it to the Windows Certificate Store of the current user without any restrictions. This issue affects Cyberduck through 9.1.6 and Mountain Duck through 4.17.5.

Affected products

• Iterate GmbH Cyberduck: up to and including 9.1.6
• Iterate GmbH Mountain Duck: up to and including 4.17.5

Published 2025-06-25. Last modified 2026-06-17.