CVE-2026-63520

Microsoft SharePoint Server Remote Code Execution Vulnerability

CVE-2026-63520 is fixed in 3 products on 1 platform, first by KB5002906, released August 11, 2026. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

Urgent

CVSS

8.1

Important

Exploitation

More likely

Vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0096

61st percentile

<p>Improper input validation in Microsoft Office SharePoint allows an unauthorized attacker to execute code 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
Improper Input Validation
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63520

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