Medium · 6.5 CVE-2026-45501 EUVD-2026-35677GHSA-rc45-hpv2-j3hh

Microsoft Exchange Server Spoofing Vulnerability

Published Jun 9, 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

Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to perform spoofing over a network.

Affected products

Vendor	Product	Affected	Fixed
Microsoft	Microsoft Exchange Server 2016 Cumulative Update 23	15.01.0.0 – < 15.01.2507.071	15.01.2507.071
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 14	15.02.0.0 – < 15.02.1544.043	15.02.1544.043
Microsoft	Microsoft Exchange Server 2019 Cumulative Update 15	15.02.0.0 – < 15.02.1748.048	15.02.1748.048
Microsoft	Microsoft Exchange Server Subscription Edition RTM	15.02.0.0 – < 15.02.2562.045	15.02.2562.045

Advisories 4

WID-SEC-2026-1849 Microsoft Windows: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
WID-SEC-2026-1846 Microsoft Exchange: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 24, 2026
NCSC-2026-0185 Kwetsbaarheden verholpen in Microsoft Exchange NCSC-NL (Netherlands) · Jun 9, 2026
MSRC-CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability Microsoft Security Response Center · Jun 9, 2026

References

Microsoft Exchange Server Spoofing Vulnerability vendor-advisory patch