A joint advisory is a coordinated security notice published by two or more agencies or trusted partners. It combines their threat intelligence, analysis, and recommended mitigations into one message so defenders can act on a consistent view of the risk.
In cyber security, joint advisories matter because they help organizations prioritize controls such as patching, account review, network monitoring, and incident response planning. They are common when a threat affects multiple sectors or when several agencies have complementary visibility into the same campaign. In practice, a joint advisory may describe attacker techniques, indicators of compromise, defensive best practices, and actions that reduce exposure. For defenders, it is a signal that the threat is credible, broadly relevant, and worth immediate review.