CVE-2020-0920Network attack vector

Authenticated code execution via unchecked package markup

Published Apr 15, 2020 · Updated Aug 4, 2024

Remote code execution in affected Microsoft SharePoint releases allows remote authenticated users to run code via a crafted application package. SharePoint fails to validate the source markup embedded in the package before processing the uploaded application content. An authenticated account capable of submitting an application package is required, and successful exploitation executes code in the SharePoint server context.

CVSS severity8.8
High
EPSS probability10.41%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in affected Microsoft SharePoint releases allows remote authenticated users to run code via a crafted application package. SharePoint fails to validate the source markup embedded in the package before processing the uploaded application content. An authenticated account capable of submitting an application package is required, and successful exploitation executes code in the SharePoint server context.

The record

CVE
CVE-2020-0920
Published
Apr 15, 2020
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2019

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft SharePoint Serverversion=2019
Microsoft · Microsoft SharePoint Foundationversion=2010 Service Pack 2; version=2013 Service Pack 1
Microsoft · Microsoft SharePoint Enterprise Serverversion=2016

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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