Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-65660

CVE-2026-65660HIGH

Microsoft SharePoint Server Remote Code Execution Vulnerability

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  H  H  H    8.8   .0210   81.1   YES

AFFECTED
  Product                                           Versions  Fixed
  Microsoft SharePoint Enterprise Server 2016       16.0.0 –  —
  Microsoft SharePoint Server 2019                  16.0.0 –  —
  Microsoft SharePoint Server Subscription Edition  16.0.0 –  —

TIMELINE
  Jul 22  Reserved by microsoft
  Aug 11  Published (CNA: microsoft)
  Aug 27  RESCORED — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). CVSS 6.5 → 8.8 (NVD).
  Sep 25  ADDED TO KEV — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). Remediation due September 28, 2026.
  Sep 29  DUE DATE PASSED — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). CISA remediation deadline was September 28, 2026; still in catalog.

CWE-94 · CNA: microsoft · CVSS v3.1 · 3 references · NVD status: Analyzed · KEV due September 28, 2026

Description

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

Lifecycle

Complete event history — 5 events, chronological
Date	Event	Detail
July 22, 2026	Reserved	Reserved by microsoft
August 11, 2026	Published	Published (CNA: microsoft)
August 27, 2026	RESCORED	RESCORED — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). CVSS 6.5 → 8.8 (NVD).
September 25, 2026	KEV ADDED	ADDED TO KEV — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). Remediation due September 28, 2026.
September 29, 2026	DUE DATE PASSED	DUE DATE PASSED — CVE-2026-65660 (Microsoft SharePoint Enterprise Server 2016). CISA remediation deadline was September 28, 2026; still in catalog.

Affected

Affected products and packages — 3 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Microsoft	Microsoft SharePoint Enterprise Server 2016	—	16.0.0	—
Microsoft	Microsoft SharePoint Server 2019	—	16.0.0	—
Microsoft	Microsoft SharePoint Server Subscription Edition	—	16.0.0	—

Weaknesses

CWE-94

References (3)

https://blog.previdian.com/cve-2026-65660-previdian-observes-two-stage-sharepoint-exploitation-attempts/ [third-party-advisory]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-65660 [vendor-advisory, patch]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-65660 [government-resource]

Authoritative record: CVE-2026-65660 at cve.org

Vendors: microsoft

Weaknesses: CWE-94

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-65660 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.