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July 15, 2026
emergency patches for Exchange

Lead story · May 23, 2026

Microsoft has released emergency patches for Exchange

Microsoft has released emergency patches for four 0-day vulnerabilities found in the code of the Exchange mail server (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065). The company warned that Chinese hackers from the Hafnium group are…

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