CISA Warns on Intune & SharePoint Exploits; Russian Spies Target Signal; DarkSword iOS Zero-Click Hits iPhones

Publication Date: March 20, 2026

Summary

This 24-hour cybersecurity brief covers a critical period from March 19-20, 2026. Key events include CISA's urgent warnings following a destructive attack on Stryker using Microsoft Intune and active exploitation of a critical SharePoint RCE flaw (CVE-2026-20963). The FBI also attributed a global phishing campaign targeting Signal and WhatsApp users to Russian Intelligence. Concurrently, researchers detailed 'DarkSword,' a potent zero-click iOS exploit chain used by spyware vendors, and the Medusa ransomware group crippled a major US medical center. These incidents highlight escalating threats against cloud management tools, critical software vulnerabilities, and secure communication platforms.

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