A trusted communication path is a channel that software treats as reliable and safe for passing data or commands. The assumption matters because systems often make security decisions based on messages received over that path, such as allowing an action, exposing context, or accepting instructions without extra verification.
In cyber security, these paths become weak points when an attacker can influence one endpoint, even indirectly. For example, a browser extension, injected script, or compromised component may feed crafted data into an assistant or service that expects honest input. The result can be unauthorized commands, altered behavior, or data leakage. Defenses include strict authentication between components, clear trust boundaries, least-privilege permissions, and validation of all inputs even when they come from an internal channel.