CVE-2026-45502

Microsoft Exchange Server Information Disclosure Vulnerability

CVE-2026-45502 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

5.0

Important

Exploitation

None reported

Exploitation Unlikely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.1964

97th percentile

<p>Server-side request forgery (ssrf) in Microsoft Exchange Server allows an authorized attacker to disclose information 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-2026-45502

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