CVE-2026-65660

Microsoft SharePoint Server Remote Code Execution Vulnerability

CVE-2026-65660 is fixed in 3 products on 1 platform, first by KB5002906, released August 11, 2026. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on September 25, 2026. Patch Radar priority: Patch now.

Patch nowCISA KEV

CVSS

8.8

Important

Exploitation

Exploited

Listed by CISA

CISA KEV

Sep 25, 2026

Federal due date Sep 28, 2026

EPSS

0.0985

95th percentile

<p>Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized 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 Control of Generation of Code ('Code Injection')
CISA required action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660

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