CISA orders federal agencies to secure Microsoft 365 tenants - CISA urges switch to Signal-like encrypted messaging apps after telecom hacks - CISA confirms critical Cleo bug exploitation in ransomware attacks - CISA warns water facilities to secure HMI systems exposed online - CISA Warns of Active Exploitation of Flaws in Zyxel, ProjectSend, and CyberPanel - CISA, FBI urge Americans to use encrypted messaging apps to combat Chinese telco hackers - CISA Urges Agencies to Patch Critical "Array Networks" Flaw Amid Active Attacks - CISA says BianLian ransomware now focuses only on data theft - CISA tags Progress Kemp LoadMaster flaw as exploited in attacks - CISA director Jen Easterly to depart agency on January 20