WaterISAC Resource Center

(TLP:GREEN) Security & Resilience Update – Ongoing Cyber and Physical Risks from the Conflict with Iran, Chinese Threat Activity, and More

(TLP:CLEAR) FIRESTARTER Backdoor and Updated Emergency Directive for CISCO Firepower and Secure Firewall Devices

(TLP:GREEN) FBI FLASH – Newly Observed Ransomware Variant Black Shrantac Threat to U.S. Entities

(TLP:AMBER+STRICT) Likely PRC State-Sponsored Activity Observed in the Water Sector – DocuSign Phishing Tactics Identified

(TLP:CLEAR) Joint Cybersecurity Advisory – Defending Against China-Nexus Covert Networks of Compromised Devices

(TLP:CLEAR) Weekly Vulnerabilities to Prioritize – April 23, 2026

(TLP:GREEN) Workplace Violence – Employee Reportedly Intentionally Sets Fire at Massive Warehouse, Possibly Motivated by Ideological Grievances

(TLP:CLEAR) Australian Risk Advisory for Critical Infrastructure – Water and Wastewater Sector

(TLP:AMBER+STRICT) E-ISAC Physical Security Report – Grid-Impacting Incidents (2024-2025)

Weekly Counterterrorism Report

(TLP:CLEAR) Supplemental General Security & Resilience Highlights – April 23, 2026

(TLP:CLEAR) CISA ICS Advisories, Additional Alerts, Updates, and Bulletins – April 23, 2026