CVE-2026-45501

Microsoft Exchange Server Spoofing Vulnerability

CVE-2026-45501 is fixed in 4 products on 1 platform, first by KB5103215, released June 9, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

6.5

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0040

34th percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5103215	Jun 9, 2026
Microsoft Exchange Server 2019 Cumulative Update 14	KB5103214	Jun 9, 2026
Microsoft Exchange Server 2019 Cumulative Update 15	KB5103213	Jun 9, 2026
Microsoft Exchange Server Subscription Edition RTM	KB5103212	Jun 9, 2026

Details

Published
June 9, 2026
Weakness
Server-Side Request Forgery (SSRF)
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45501

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