This CII Badging requirement says:

"The project MUST implement secure design principles (from 'know_secure_design'), where applicable. If the project is not producing software, select 'not applicable' (N/A).

The CII details for this requirement say:

For example, the project results should have fail-safe defaults (access decisions should deny by default, and projects' installation should be secure by default). They should also have complete mediation (every access that might be limited must be checked for authority and be non-bypassable). Note that in some cases principles will conflict, in which case a choice must be made (e.g., many mechanisms can make things more complex, contravening 'economy of mechanism' / keep it simple).