CVE-2026-65660: high-severity vulnerability in Microsoft SharePoint Enterprise Server 2016
Microsoft SharePoint Server Remote Code Execution Vulnerability
Published · Updated
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
Prioritize patching. It under exploitation confirmed by CISA, has an official Brazilian government alert and has a public proof of concept.
Brazil's federal government published an alert, recommendation or bulletin that cites this vulnerability.
- CISC Gov.br · 30 Sep 2026Boletim do CISC de Vulnerabilidadesread on gov.br ↗
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.
A flaw in Microsoft SharePoint Server allows an authorized user to inject and execute malicious code on the server, potentially compromising the entire system. This is dangerous because it gives attackers a way to run commands with the server's privileges.
CWE-94 code injection vulnerability in Microsoft Office SharePoint's code generation mechanism allows an authenticated attacker to inject arbitrary code that is executed server-side with elevated privileges. Attack vector requires network access and valid authentication credentials; successful exploitation results in remote code execution within the SharePoint process context.
In the same product, most dangerous first.