Messaging giant WhatsApp won a landmark ruling Friday against the best-known maker of spyware when a federal judge in California ruled that NSO Group had hacked into the Meta unit’s systems by sending malicious software through its servers to more than a thousand targeted phones.

The U.S. Supreme Court decided on Wednesday to hear a bid by TikTok and its China-based parent company ByteDance to block a law intended to force the sale of the short-video app by Jan. 19 or face a ban on national security grounds.

NSO Group, the organization behind the Pegasus spyware, has been found liable in a lawsuit brought by Meta’s WhatsApp over attacks on about 1,400 devices, as reported by The Record. NSO Group is liable for charges of violation of the Computer Fraud and Abuse Act,