CVE-2025-41255

High

Description

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.

SeverityHigh

CVSS8.0

Exploit probability—

ProductCyberduck

PublishedJun 25, 2025

First seenJun 25, 2025

Weakness typeCWE-266CWE-266

How to fix

Vendor advisories

github.com/iterate-ch/cyberduck/security/advisories/GHSA-vjjc-grpp-m655

Affected products

Product	Affected versions	Fixed in
iterate GmbH Cyberduck	v ≤ 9.1.6	—
iterate GmbH Mountain Duck	v ≤ 4.17.5	—

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.