CVE-2020-1183Network attack vector

Authenticated script execution via unsanitized web requests

Published Jun 9, 2020 · Updated Feb 28, 2025

Cross-site scripting in Microsoft SharePoint 2013 SP1, 2016, and 2019 allows remote authenticated users to run script via crafted requests. Microsoft disclosed only that the server fails to sanitize a specially crafted web request; no affected handler, parameter, or encoding operation is public. Exploitation requires SharePoint access and victim interaction, and the resulting script runs in the victim browser context to read or alter accessible site content.

CVSS severity5.4
Medium
EPSS probability1.49%
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 crafted requests. Microsoft disclosed only that the server fails to sanitize a specially crafted web request; no affected handler, parameter, or encoding operation is public. Exploitation requires SharePoint access and victim interaction, and the resulting script runs in the victim browser context to read or alter accessible site content.

The record

CVE
CVE-2020-1183
Published
Jun 9, 2020
Updated
Feb 28, 2025
Vendor
Microsoft
Product
Microsoft SharePoint Server
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 9, 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

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV: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')
T1059.007JavaScript/JScript

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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