MSRC-CVE-2026-62913 — 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 could exploit this vulnerability by sending a specially crafted request to an affected service over the network. Successful exploitation could allow the attacker to execute code on the target system.

Security updates
15.01.2507.072 — https://support.microsoft.com/help/5121576
15.02.2562.046 — https://support.microsoft.com/help/5121573
15.02.1748.049 — https://support.microsoft.com/help/5121574
15.02.1544.044 — https://support.microsoft.com/help/5121575

Vulnerabilities 1

High 8.8

CVE-2026-62913

Microsoft Exchange Server Remote Code Execution Vulnerability

Heap-based buffer overflow 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

Aug 11, 2026

Revision history

2026-10-20 #4
Updated an acknowledgement. This is an informational change only.
2026-08-13 #3
Added acknowledgements. This is an informational change only.
2026-08-12 #2
Updated an acknowledgement. This is an informational change only.
2026-08-11 #1
Information published.

References

CVE-2026-62913 Microsoft Exchange Server Remote Code Execution Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62913
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