CVE-2026-65660: Microsoft SharePoint Code Injection Vulnerability

Added to the CISA Known Exploited Vulnerabilities catalog on 25 Sep 2026. Vendor: Microsoft. Product: SharePoint.

Microsoft SharePoint contains a code injection vulnerability which could allow an authorized attacker to execute code over a network.

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. (due 28 Sep 2026)