What term is used for unauthorized disclosure of classified information?

The term "compromise" is used to describe the unauthorized disclosure of classified information. In the context of national security and classified materials, a compromise indicates that sensitive data has been made accessible to individuals who do not have the proper clearance or need to know. This term highlights both the breach of trust and the potential risk to national security that results from such unauthorized access.

On the other hand, while "leakage" can refer to the uncontrolled release of information, it is often associated with information that is not necessarily classified or is disclosed in a less formal context. "Disclosure" is a broader term that simply refers to making information known but does not inherently carry the connotation of unauthorized access or risk. "Breach" typically refers to a violation of a security protocol or system; while it can relate to compromise, it does not specifically denote the act of disclosing classified information in the same direct manner as "compromise" does.