Chinese state-sponsored hackers breached the US Treasury Department’s computer systems this month, stealing documents in what the department described as a “major incident,” Reuters reported. The breach occurred through a third-party cybersecurity provider, BeyondTrust, according to a letter sent to US lawmakers and shared with Reuters. Hackers managed to access an important security key used by BeyondTrust, allowing them to bypass protections on a cloud-based service used to provide technical support to the Treasury Department. With this access, the attackers could reach certain user workstations and obtain unclassified documents. BeyondTrust, based in Georgia, disclosed the issue on its website, stating that a “digital key had been compromised” in an incident affecting a small number of its clients. The company added that an investigation is ongoing but did not respond to further comments. The Treasury Department said it learned about the breach on 8 December, after being alerted by BeyondTrust. It is now working with the FBI and the Cybersecurity and Infrastructure Security Agency (CISA) to understand the full impact. CISA directed all questions to the …