Denial of Service Vulnerability in Microsoft Exchange Server
CVE-2026-118153

7.5HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft Exchange Server Subscription Edition Rtm
Vendor
CVE Published:
10 November 2026

What is CVE-2026-118153?

A vulnerability in Microsoft Exchange Server has been identified, characterized by inefficient algorithmic complexity. This flaw could be exploited by an unauthorized attacker to cause a denial of service over the network, potentially disrupting services and affecting the availability of the server. Organizations are advised to apply the latest security patches and follow best practices for network security to mitigate this risk.

Affected Version(s)

Microsoft Exchange Server Subscription Edition RTM x64-based Systems 15.02.0.0 < 15.02.2562.057

References

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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.