CVE-2020-0973Network attack vector

Authenticated script execution via unsanitized web request

Published Apr 15, 2020 · Updated Feb 28, 2025

Cross-site scripting in affected Microsoft SharePoint Server releases allows remote authenticated users to run script via crafted web requests. Microsoft has disclosed only that SharePoint fails to sanitize a specially crafted web request; the affected request handler and input field remain undisclosed. Affected releases are 2010 Service Pack 2, 2013 Service Pack 1, 2016, and 2019; low-privileged access and victim interaction are required, and exploitation runs attacker-controlled script in the victim browser context.

CVSS severity6.1
Medium
EPSS probability1.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in affected Microsoft SharePoint Server releases allows remote authenticated users to run script via crafted web requests. Microsoft has disclosed only that SharePoint fails to sanitize a specially crafted web request; the affected request handler and input field remain undisclosed. Affected releases are 2010 Service Pack 2, 2013 Service Pack 1, 2016, and 2019; low-privileged access and victim interaction are required, and exploitation runs attacker-controlled script in the victim browser context.

The record

CVE
CVE-2020-0973
Published
Apr 15, 2020
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 15, 2020CVE publishedPublication date reported by the CVE source.
  2. Feb 28, 2025Record 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=2010 Service Pack 2
  2. Affected versionversion=2019

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

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

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.0NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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