CVE-2026-42897

High

Open

KEV

TLP:CLEAR

Microsoft Exchange Server Spoofing Vulnerability

NVD CVE.org

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CVSS Score: 8.1
EPSS Score ⓘ: 70.31%

99.3th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:F/RL:O/RC:C
Confidence: 100%
Published: May 14, 2026
Last Modified: May 14, 2026
CISA KEV
Date Added: May 15, 2026
Patch Due: May 29, 2026
Required Action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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