CVE-2020-0933Network attack vector

Session data access via unsanitized web request

Published Apr 15, 2020 · Updated Feb 28, 2025

Cross-site scripting in Microsoft SharePoint 2013 SP1, 2016, and 2019 allows remote authenticated users to run script via a crafted web request. The request-processing path fails to sanitize attacker-controlled input before emitting it into a SharePoint page; Microsoft has not disclosed the affected endpoint or parameter. Exploitation requires authenticated access and victim interaction with the crafted content, enabling script to read or alter data available in the victim's SharePoint session.

CVSS severity5.4
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 Microsoft SharePoint 2013 SP1, 2016, and 2019 allows remote authenticated users to run script via a crafted web request. The request-processing path fails to sanitize attacker-controlled input before emitting it into a SharePoint page; Microsoft has not disclosed the affected endpoint or parameter. Exploitation requires authenticated access and victim interaction with the crafted content, enabling script to read or alter data available in the victim's SharePoint session.

The record

CVE
CVE-2020-0933
Published
Apr 15, 2020
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-79
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

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4CISA-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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')

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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