CISA Cybersecurity Advisories

23 August 2026

• Defending Against an Active Threat to Siemens S7 Series PLCs

  Executive summary

  Note: This advisory relates to

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• #StopRansomware: Gunra Ransomware

  Advisory at a

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• Russian State-Supported Cyber Actors Conduct Phishing Campaign Targeting Users of Zimbra Collaboration Suite
  ...