Do Son Microsoft links Exchange Server instability to October 2026 Windows updates. See the OWA and mail queue symptoms, plus the registry fix.
OWA
Exploited in the Wild: Critical OWA Spoofing Flaw (CVE-2026-42897) Hits On-Premises Exchange Servers
Exploited in the Wild: Critical OWA Spoofing Flaw (CVE-2026-42897) Hits On-Premises Exchange Servers
CVE-2026-42897 exploited in the wild. A 8.1 CVSS OWA flaw allows RCE via malicious emails. Verify your Exchange Emergency Mitigation (EM) status now!
New "Exfil Out&Look" attack uses OWA add-ins to steal emails without leaving logs. Microsoft has no immediate fix for this blind spot.