CVE-2026-64921

Microsoft SharePoint Server Elevation of Privilege Vulnerability

CVE-2026-64921 is fixed in 3 products on 1 platform, first by KB5002906, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

8.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0094

61st percentile

<p>Missing authentication for critical function in Microsoft Office SharePoint allows an authorized attacker to elevate privileges over a network.</p>

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft SharePoint Enterprise Server 2016	KB5002906	Aug 11, 2026
Microsoft SharePoint Enterprise Server 2016	KB5002905	Aug 11, 2026
Microsoft SharePoint Server 2019	KB5002896	Aug 11, 2026
Microsoft SharePoint Server 2019	KB5002894	Aug 11, 2026
Microsoft SharePoint Server Subscription Edition	KB5002893	Aug 11, 2026

Details

Published
August 11, 2026
Weakness
Missing Authentication for Critical Function
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64921

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