Wire · technology
CISA: How Medusa Ransomware Attacked 500+ Critical Companies
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Fusion42 · 20 August 2026 · Fusion42 review
The CISA, FBI, and HHS issued a joint advisory detailing the tactics of the Medusa ransomware group, which targeted over 500 organisations in critical infrastructure sectors from 2021 through 2026, exploiting unpatched software, phishing, and lateral movement techniques using legitimate remote management tools.
This Wire brief sits within Fusion42's coverage of Cybersecurity, and 11 sources have reported it between 18 Aug 2026 and 25 Aug 2026.
◆ ◆ The Wire takeaway
Medusa ransomware's focus on critical infrastructure means you must harden your patching processes and limit remote access tools immediately. Letting these attacker tactics slide risks devastating operational disruptions and regulatory penalties.
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11 sources · first reported 18 Aug 2026 · latest 25 Aug 2026
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