Cockpit (and its plugins) do not seem to protect itself against clickjacking. It is possible to render a page from a cockpit server via another website inside an <iFrame> HTML entry. This may be used by a malicious website in clickjacking or similar attacks.

...

UBUNTU-CVE-2021-3660

Cockpit and its plugins do not seem to protect itself against clickjacking. It is possible to render a page from a cockpit server via another website, inside an HTML entry. This may be used by a malicious website in clickjacking or similar attacks...