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Abstract protected email server and endpoint devices in a business cybersecurity environment

Exploited Exchange Server Flaw: Check On-Prem Email Before Attackers Abuse Trust

CISA lists CVE-2026-42897 as known exploited. Businesses still running on-prem Exchange should verify mitigation, logs, and patch status now.

May 29, 2026

4 min read

Business email server security dashboard showing protected message flows and emergency mitigation controls

Managed IT ServicesSecurity

Exchange Server Zero-Day: Check Emergency Mitigation Before It Becomes a Business Problem

Microsoft and CISA warn that an on-premises Exchange Server vulnerability is being exploited. Businesses should verify emergency mitigation, exposure, and monitoring.

May 18, 2026

5 min read