Microsoft SharePoint Code Injection Vulnerability

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• cpe microsoft/sharepoint server2016
• cpe microsoft/sharepoint server2019
• vendor Microsoft SharePointversion unspecified

How to fix CVE-2026-65660

• Recommended 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. CISA due date Sep 28, 2026.

• Official advisories

  • CISA KEV · cisa.gov
  • CVE.org · cve.org
  • FIRST EPSS · first.org
  • NIST NVD · nvd.nist.gov
  • VulnCheck KEV · vulncheck.com

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Aug 11, 2026 · Catalog

   Detected

   Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

2. Sep 25, 2026 · CISA KEV

   Known exploited

   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

3. Sep 25, 2026 · Catalog

   Updated

   Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

4. Sep 28, 2026 · CISA KEV

   Remediation due

   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

Sources

• CISA KEVConfirmed exploitationCVE-2026-65660

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

  cisa.gov
• CVE.orgVulnerability recordCVE-2026-65660

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2026-65660

  30-day exploitation probability 2.1%

  first.org
• NIST NVDVulnerability recordCVE-2026-65660

  Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

  nvd.nist.gov
• VulnCheck KEVConfirmed exploitationCVE-2026-65660

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

  vulncheck.com

References

• Third Party Advisory · blog.previdian.com
• CISA note · msrc.microsoft.com
• CISA note · nvd.nist.gov
• VulnCheck exploitation evidence · previdian.com
• US Government Resource · cisa.gov
• CISA note · cisa.gov
• CISA note · cisa.gov
• VulnCheck exploitation evidence · cisa.gov

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.