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CVE-2026-55008CriticalMonitor

Microsoft Exchange Server Spoofing Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 9.6)

Spoofing · Critical · CVSS 9.6. Affects: Exchange Server.

CVSS 9.6EPSS 0.9%Security update published 2026-08-21Applies to On-premisesNVD

Affected: Exchange Server

Related changes

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