High · 8.8 CVE-2026-62913 EUVD-2026-56415GHSA-9c4p-v976-93rw

Microsoft Exchange Server Remote Code Execution Vulnerability

Published Aug 11, 2026 · Updated Nov 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Microsoft Exchange Server 2016 Cumulative Update 23 Product: Microsoft Exchange Server 2019 Cumulative Update 14 Product: Microsoft Exchange Server 2019 Cumulative Update 15 Product: Microsoft Exchange Server Subscription Edition RTM

Description

Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 – < 15.01.2507.072	15.01.2507.072
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 – < 15.02.1544.044	15.02.1544.044
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 – < 15.02.1748.049	15.02.1748.049
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 – < 15.02.2562.046	15.02.2562.046

Advisories 4

MSRC-CVE-2026-62913 Microsoft Exchange Server Remote Code Execution Vulnerability Microsoft Security Response Center · Oct 20, 2026
WID-SEC-2026-2756 Microsoft Windows Produkte: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 30, 2026
WID-SEC-2026-2784 Microsoft Exchange Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 31, 2026
NCSC-2026-0289 Kwetsbaarheden verholpen in Microsoft Exchange server NCSC-NL (Netherlands) · Aug 28, 2026

References

Microsoft Exchange Server Remote Code Execution Vulnerability vendor-advisory patch