CVE-2026-42897

high Microsoft ⚠️ CISA KEV — Exploited in the Wild
CVSS v3 Base Score
8.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
EPSS Score
2.5%
Exploitation probability in 30 days
Top 17% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Confidentiality
High
Integrity
High
Availability
None
Published: May 14, 2026 (56 days ago)
Last Modified: June 15, 2026
Vendor: Microsoft
Source: NVD

⚠️ CISA Known Exploited Vulnerability

Added to KEV: 2026-05-15
Remediation Due: 2026-05-29 (⚠ 42d overdue)

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.

CWE

CWE-79

Affected Products

microsoft exchange servermicrosoft exchange server subscription edition

References

🔗 msrc.microsoft.com 🔗 www.cisa.gov