CVE-2026-42897

HIGH8.1

CISA KEV

Published 2026-05-14 · Updated 2026-10-26 · Source secure@microsoft.com

Summary

CVE-2026-42897 is a high-severity (CVSS 8.1) vulnerability in Microsoft Microsoft. CISA added it to the Known Exploited Vulnerabilities catalog on May 15, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by May 29, 2026. CISA does not currently list it as used in ransomware campaigns. Microsoft has 390 vulnerabilities in the KEV catalog, 117 of them linked to ransomware.

All 390 known-exploited Microsoft vulnerabilities →

Description

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.

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

CWE-79

CISA Known-Exploited Vulnerability

Product: Microsoft — Microsoft

Name: Microsoft Exchange Server Cross-Site Scripting Vulnerability

Date added: 2026-05-15 · Due: 2026-05-29

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.

References

View on NVD

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