CVE-2026-65660
KEV: known exploited SSVC: activeMicrosoft SharePoint Server Remote Code Execution Vulnerability
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vector| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | L | Low (easy) |
| Privileges required PR | L | Regular user |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Description
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
CISA KEV entry
Microsoft SharePoint Code Injection Vulnerability — Microsoft / 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.
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 ; ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-65660
CVSS assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 3.1 | 8.8 HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| CNA / microsoft | 3.1 | 8.8 HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft SharePoint Enterprise Server 2016 | affected: 16.0.0 … < 16.0.5565.1001 |
| Microsoft | Microsoft SharePoint Server 2019 | affected: 16.0.0 … < 16.0.10417.20198 |
| Microsoft | Microsoft SharePoint Server Subscription Edition | affected: 16.0.0 … < 16.0.19725.20522 |
NVD CPE (3)
Show CPE list
| Vendor | Product | Range | CPE |
|---|---|---|---|
| microsoft | sharepoint_server | < 16.0.19725.20522 | cpe:2.3:a:microsoft:sharepoint_server:*:*:*:*:subscription:*:*:* |
| microsoft | sharepoint_server | cpe:2.3:a:microsoft:sharepoint_server:2016:*:*:*:enterprise:*:*:* | |
| microsoft | sharepoint_server | cpe:2.3:a:microsoft:sharepoint_server:2019:*:*:*:*:*:*:* |
Linux distribution status
References (3)
- https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/ NVD, ADP CISA-ADP Third Party Advisorythird-party-advisory
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 NVD, CNA PatchVendor Advisoryvendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660 NVD, ADP CISA-ADP US Government Resourcegovernment-resource