High MSRC-CVE-2026-45501 1 CVE

Microsoft Exchange Server Spoofing Vulnerability

Published Jun 9, 2026 · Updated Jun 9, 2026

Vendor: Microsoft

Summary

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

Details

Security updates
15.02.2562.045 — https://support.microsoft.com/help/5103212
15.01.2507.071 — https://support.microsoft.com/help/5103215
15.02.1748.048 — https://support.microsoft.com/help/5103213
15.02.1544.043 — https://support.microsoft.com/help/5103214

Vulnerabilities 1

Medium 6.5

CVE-2026-45501

Microsoft Exchange Server Spoofing Vulnerability

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

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

Jun 9, 2026

Revision history

2026-06-09 #1
Information published.

References

CVE-2026-45501 Microsoft Exchange Server Spoofing Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501
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