An authenticated user session is the logged-in state a system creates after it verifies a user’s identity. During that session, the application recognizes the user and enforces their assigned permissions, such as which files, tools, or commands they can access. Session tokens, cookies, or workspace credentials usually represent this state.
In cyber security, sessions matter because many attacks do not need to break authentication if they can exploit an active session. A malicious link, injected prompt, or stolen session token can abuse the victim’s existing access and make harmful actions look legitimate. In AI-enabled tools, this is especially important: an attacker may not need to log in as an admin if they can manipulate a logged-in user’s assistant to read or reveal data already available in that session. Defenses include strong session handling, short-lived tokens, reauthentication for sensitive actions, least-privilege permissions, and careful validation of any input that arrives through a trusted session.