User Interface Misrepresentation in Microsoft Exchange Server
CVE-2026-21527

6.5MEDIUM

Key Information:

Vendor

Microsoft
Status
Microsoft Exchange Server 2016 Cumulative Update 23
Microsoft Exchange Server 2019 Cumulative Update 14
Microsoft Exchange Server 2019 Cumulative Update 15
Microsoft Exchange Server Subscription Edition Rtm
Vendor
CVE Published:
10 February 2026

What is CVE-2026-21527?

A vulnerability in Microsoft Exchange Server allows attackers to exploit user interface misrepresentation, leading to potential spoofing attacks over a network. This flaw could enable unauthorized individuals to falsify critical information, potentially compromising security and integrity within the affected systems.

Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems 15.01.0.0 < 15.01.2507.066

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems 15.02.0.0 < 15.02.1544.039

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems 15.02.0.0 < 15.02.1748.043

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

EPSS Score

9% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.