CVE-2026-65813

Microsoft Exchange Server Elevation of Privilege Vulnerability

CVE-2026-65813 is fixed in 4 products on 1 platform, first by KB5121576, released August 11, 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

0.0094

61st percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Exchange Server 2016 Cumulative Update 23	KB5121576	Aug 11, 2026
Microsoft Exchange Server 2019 Cumulative Update 14	KB5121575	Aug 11, 2026
Microsoft Exchange Server 2019 Cumulative Update 15	KB5121574	Aug 11, 2026
Microsoft Exchange Server Subscription Edition RTM	KB5121573	Aug 11, 2026

Details

Published
August 11, 2026
Weakness
Server-Side Request Forgery (SSRF)
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65813

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