CVE-2020-0932Public exploitNetwork attack vector

Authenticated code execution via unsafe TypeConverter deserialization

Published Apr 15, 2020 · Updated Aug 4, 2024

Deserialization in Microsoft SharePoint 2013 SP1, 2016, and 2019 allows remote authenticated users to execute code via WebPart XML. WebPartPages.asmx accepts attacker-chosen property type names and text, then ImportWebPartFile selects the named .NET TypeConverter and converts the text into an object that reaches BinaryFormatter deserialization. Exploitation requires Add or Customize Pages permission; default site creation grants an authenticated user that access, and code runs as the SharePoint web application service account.

CVSS severity8.8
High
EPSS probability31.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization in Microsoft SharePoint 2013 SP1, 2016, and 2019 allows remote authenticated users to execute code via WebPart XML. WebPartPages.asmx accepts attacker-chosen property type names and text, then ImportWebPartFile selects the named .NET TypeConverter and converts the text into an object that reaches BinaryFormatter deserialization. Exploitation requires Add or Customize Pages permission; default site creation grants an authenticated user that access, and code runs as the SharePoint web application service account.

The record

CVE
CVE-2020-0932
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=2013 Service Pack 1
Microsoft · Microsoft SharePoint Enterprise Serverversion=2016

Published CVSS scores

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

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.

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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 exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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