CVE-2026-65660
HighMicrosoft SharePoint Code Injection Vulnerability
8.8 CVSS v3.1
- Published
- Aug 11, 2026
- Updated
- Oct 26, 2026
- Vendor
- Microsoft
- Affected versions
- See affected products
- Weakness
- CWE-94
Summary
Improper control of generation of code (‘code injection’) in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Severity
High (8.8)CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
- Microsoft Sharepoint Server < 16.0.19725.20522
- Microsoft Sharepoint Server 2016
- Microsoft Sharepoint Server 2019
Exploitation status
Actively exploited
Listed in the CISA Known Exploited Vulnerabilities catalog on Sep 25, 2026. Federal remediation due: Sep 28, 2026.
Technical details
Technical analysis has not been written for this record yet.
Mitigation & remediation
- 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.