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CVE-2026-42897

HighPublished

Microsoft Exchange Server Spoofing Vulnerability

Published: May 14, 2026
Updated: Aug 10, 2026
Assigning CNA: microsoft
Evidence observed: May 15, 2026

Primary CVSS

8.1/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS probability estimate

71.8%

High · next 30 days

Percentile: 99.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.

Sources

CVE-2026-42897Research
CVE-2026-42897 - Exchange Health Checker blind spot: outbound IIS URL Rewrite rules silently ignored, making EOMT mitigations invisible in diagnostic reports.

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