What is CVE-2026-65660?
Improper control of generation of code ('code injection') in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Timeline
- 2026-08-11Published to the U.S. National Vulnerability Database (NVD)
- 2026-09-25Added to the CISA Known Exploited Vulnerabilities (KEV) catalog
- 2026-09-27First covered in a defend.network daily briefing
- 2026-09-28CISA federal remediation deadline (BOD 22-01)
- 2026-10-26NVD record last updated
CISA Known Exploited Vulnerability
Microsoft SharePoint Code Injection Vulnerability
Affected product
Microsoft SharePoint
Remediation Steps
- Apply the latest Microsoft security patch
- Prioritize patching across all affected systems
- Monitor email systems and document processing for suspicious activity
- Review recent file access and document modification logs
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660
- https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660
- https://nvd.nist.gov/vuln/detail/CVE-2026-65660
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Referenced in our briefings & reports
- Vulnerability Priority Report – Week 3 of October 2026 (October 19 – 25)
- Vulnerability Priority Report – Week 2 of October 2026 (October 12 – 18)
- Vulnerability Priority Report – Week 1 of October 2026 (October 5 – 11)
- Vulnerability Priority Report – Week 4 of September 2026 (September 28 – October 4)
- Vulnerability Priority Report – Week 3 of September 2026 (September 21 – 27)
- Oracle PeopleSoft, Microsoft patches, Elementor RCE under active exploitation (2026-09-27)
Related vulnerabilities
- CVE-2026-50522 – Microsoft SharePoint (same product)
- CVE-2026-55040 – Microsoft SharePoint (same product)
- CVE-2026-58644 – Microsoft SharePoint (same product)
- CVE-2026-56164 – Microsoft SharePoint Server (same product)
- CVE-2026-45659 – Microsoft SharePoint Server (same product)
- CVE-2026-32201 – Microsoft SharePoint Server (same product)
Browse all tracked CVEs in the defend.network CVE database →
🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.