Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2020-1023

CVE-2020-1023HIGH

Microsoft SharePoint 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   .0372   89.5     —

AFFECTED
  Product                                              Versions  Fixed
  Microsoft SharePoint Enterprise Server 2016          16.0.0 –  —
  Microsoft SharePoint Foundation 2013 Service Pack 1  15.0.0 –  —
  Microsoft SharePoint Server 2019                     16.0.0 –  —

TIMELINE
  Nov 4   Reserved by microsoft
  May 21  Published (CNA: microsoft)
  Aug 19  ENRICHED — CVE-2020-1023 (Microsoft SharePoint Enterprise Server 2016). Received CVSS 8.8 and CPE data from NVD.

CWE-434 · CNA: microsoft · CVSS v3.1 · 2 references · NVD status: Modified

Description

A remote code execution vulnerability exists in Microsoft SharePoint when the software fails to check the source markup of an application package. An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the SharePoint application pool and the SharePoint server farm account. Exploitation of this vulnerability requires that a user uploads a specially crafted SharePoint application package to an affected version of SharePoint. The security update addresses the vulnerability by correcting how SharePoint checks the source markup of application packages.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
November 4, 2019	Reserved	Reserved by microsoft
May 21, 2020	Published	Published (CNA: microsoft)
August 19, 2026	ENRICHED	ENRICHED — CVE-2020-1023 (Microsoft SharePoint Enterprise Server 2016). Received CVSS 8.8 and CPE data from NVD.

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 Foundation 2013 Service Pack 1	—	15.0.0	—
Microsoft	Microsoft SharePoint Server 2019	—	16.0.0	—

Weaknesses

CWE-434

References (2)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1023
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1023 [Patch, Vendor Advisory]

Authoritative record: CVE-2020-1023 at cve.org

Vendors: microsoft

Weaknesses: CWE-434

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2020-1023 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 Sunday, October 4, 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.