Elevation of Privilege Vulnerability in Microsoft Exchange Server
CVE-2026-69641

9.1CRITICAL

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:
8 September 2026

What is CVE-2026-69641?

A significant security flaw exists within Microsoft Exchange Server, where missing authorization could allow an authorized attacker to escalate their privileges across a network. This vulnerability poses a serious risk, enabling potential unauthorized access to sensitive data and critical system resources. It is essential for organizations utilizing these versions of Exchange Server to stay informed and apply the necessary security patches to mitigate risks associated with this vulnerability.

Affected Version(s)

Microsoft Exchange Server 2016 Cumulative Update 23 x64-based Systems 15.01.0.0 < 15.01.2507.073

Microsoft Exchange Server 2019 Cumulative Update 14 x64-based Systems 15.02.0.0 < 15.02.1544.046

Microsoft Exchange Server 2019 Cumulative Update 15 x64-based Systems 15.02.0.0 < 15.02.1748.051

References

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

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.