A sealed complaint is a court filing that is kept partly out of public view. In practice, some allegations, names, evidence, or supporting details may be withheld while a judge limits access to the record. The public may know that a case exists, but not the full technical or factual basis.
In cyber security, sealed complaints matter because investigations often involve active threats, undercover work, or evidence that could reveal sources and methods. For defenders, a sealed filing means public reporting may be incomplete, so attribution and impact should be treated cautiously. Attackers may also benefit from the uncertainty, while security teams should use the limited facts only to guide monitoring, credential review, and incident response, not to draw final conclusions.