MSRC-CVE-2026-69355 — Microsoft Exchange Server Remote Code Execution Vulnerability

Summary

Impact: Remote Code Execution. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

How could an attacker exploit this vulnerability?
An authenticated attacker with low-level access to an affected server could send a specially crafted request to execute code on the server. User interaction is not required.

Security updates
15.02.1748.051 — https://support.microsoft.com/help/5121609
15.02.1544.046 — https://support.microsoft.com/help/5121610
15.01.2507.073 — https://support.microsoft.com/help/5121611
15.02.2562.049 — https://support.microsoft.com/help/5121608

Vulnerabilities 1

High 8.8

CVE-2026-69355

Microsoft Exchange Server Remote Code Execution Vulnerability

External control of file name or path in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Microsoft Microsoft Exchange Server 2016 Cumulative Update 23 Microsoft Exchange Server Subscription Edition RTM Microsoft Exchange Server 2019 Cumulative Update 14

Sep 8, 2026

Revision history

2026-09-08 #1
Information published.

References

CVE-2026-69355 Microsoft Exchange Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69355
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss