Privacy violations occur when: private user information enters the program. The data is written to an external location, such as the console, file system, or network. Private data can enter a program in a variety of ways: directly from the user in the form of a password or personal information. Indirectly from a database or other data store by the application, or from a partner or other third party. The collection and management of private data is becoming increasingly regulated. Privacy violations continue to occur with alarming frequency.”]
Source: https://owasp.org/www-community/vulnerabilities/Privacy_Violation