Cyber threat information sharing is the exchange of indicators, tactics, incident details, and defensive guidance among organizations. Shared indicators might include malicious IP addresses, domains, file hashes, or behavior patterns; context and confidence levels help recipients judge whether and how to act on them.
Sharing can help defenders detect attacks sooner, coordinate response, and improve security controls, especially across critical infrastructure. In practice, organizations may exchange machine-readable indicators through dedicated platforms or share incident reports and defensive advice through trusted channels. Effective sharing depends on timely, relevant information, appropriate privacy and handling safeguards, and clear validation steps. Unverified or low-value data can create noise, so legal permission to share is only one part of making threat intelligence useful.