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DHS Reports Provide Network Defenders with Important Threat Information to Mitigate Iranian-affiliated Malicious Cyber Activity

(TLP:AMBER) The DHS Office of Intelligence and Analysis (I&A) recently released several reports highlighting continued Iranian cyber threat actor targeting of critical infrastructure. The reports provide information on threat actor tactics, indicators of compromise (IOCs), and exploitation of software. Amid the continuing conflict between the U.S. and Iran, alongside past Iranian cyber attacks against U.S. water and wastewater utilities, WaterISAC continues to encourage all utilities to maintain a “Shields Up” posture and heightened vigilance…

General Security and Resilience

(TLP:AMBER+STRICT) Situation Report: Heightened Threat Environment – Potential Retaliation by Iranian Threat Actors Following U.S. Strikes on Iran (Updated September 17, 2026)

(TLP:CLEAR) Implementing Effective Crisis Communications for Natural Disasters and Other Emergencies

(TLP:CLEAR) Water Utility Climate Alliance Report – Climate Resilient Engineering Design Guidance for the Water Sector

(TLP:AMBER) NCTC Report – Analytic Compendium on the 9/11 Terrorist Attacks and the Current Terrorist Threat Landscape

(TLP:AMBER) DHS Report – Mobilization Indicators: Detection and Disruption Opportunities for U.S.-Based Violent Extremists

(TLP:CLEAR) Supplemental General Security & Resilience Highlights – September 17, 2026

(TLP:AMBER) NCTC Counterterrorism Weekly: September 10 – 16, 2026

Cybersecurity

Tip of the Week – September 17, 2026

(TLP:AMBER+STRICT) Vulnerability Notification – Zimbra and BitLocker Vulnerabilities Pose Elevated Risk

(TLP:AMBER) DHS Reports Provide Network Defenders with Important Threat Information to Mitigate Iranian-affiliated Malicious Cyber Activity

(TLP:AMBER+STRICT) Recent IOCs Shared in the WaterISAC Slack Workspace (September 17, 2026)

(TLP CLEAR) Weekly Vulnerabilities to Prioritize – September 17, 2026

(TLP:CLEAR) CISA ICS Advisories, Additional Alerts, Updates, and Bulletins – September 17, 2026

(TLP:GREEN) WaterISAC Completes Participation in Cyber Storm X Exercise

(TLP:CLEAR) CISA Guidance Explains How Cyber Decoys Strengthen Detection and Response

(TLP:CLEAR) CISA Highlights Multinational Guidance on Detecting and Mitigating Active Directory Compromises

(TLP:AMBER) WaterISAC Advisory – Hacktivists Vow to Intensify Attacks on Water and Critical Infrastructure (Updated September 11, 2026)

WaterISAC Events

Water Sector Cyber Resilience Briefing – The Advisory Is Correct. Now What? Practical Actions for Water Utilities of Every Size

Water Sector Physical Threat Briefing – Building Security Culture through Training and Engagement

H2OEx- Chicago, IL