CVE-2020-0924Network attack vector

Authenticated script execution via unsanitized web request

Published Apr 15, 2020 · Updated Feb 28, 2025

Cross-site scripting in Microsoft SharePoint Server 2019 allows remote authenticated users to execute script via a crafted web request. SharePoint fails to properly sanitize attacker-controlled request data at the affected web endpoint, allowing script content to reach a user's browser in the SharePoint context. Exploitation requires a valid SharePoint account and victim interaction with the resulting content; the documented impact is browser-context data access or modification rather than server-side code execution.

CVSS severity5.4
Medium
EPSS probability1.83%
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 Microsoft SharePoint Server 2019 allows remote authenticated users to execute script via a crafted web request. SharePoint fails to properly sanitize attacker-controlled request data at the affected web endpoint, allowing script content to reach a user's browser in the SharePoint context. Exploitation requires a valid SharePoint account and victim interaction with the resulting content; the documented impact is browser-context data access or modification rather than server-side code execution.

The record

CVE
CVE-2020-0924
Published
Apr 15, 2020
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-79, T1189
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=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

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/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')
T1189Drive-by Compromise

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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