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CVE-2026-56191CriticalMonitor

Microsoft Exchange Online Tampering Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 10)

Tampering · Critical · CVSS 10. Affects: Exchange Server.

CVSS 10EPSS 0.7%Security update published 2026-08-21Applies to On-premisesNVD

Affected: Exchange Server

Related changes

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