CVE-2023-21570Network attack vector

Authenticated browser script execution

Published Feb 14, 2023 · Updated Aug 19, 2026

Cross-site scripting in Microsoft Dynamics 365 on-premises before 9.0.45.11 and before 9.1.16.20 allows remote authenticated users to run script. Microsoft has not published the affected web page, input field, or encoding operation that mishandles attacker-controlled content. Exploitation requires authenticated content submission and user interaction; successful script execution can read or alter browser-accessible data.

CVSS severity5.4
Medium
EPSS probability0.61%
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 Dynamics 365 on-premises before 9.0.45.11 and before 9.1.16.20 allows remote authenticated users to run script. Microsoft has not published the affected web page, input field, or encoding operation that mishandles attacker-controlled content. Exploitation requires authenticated content submission and user interaction; successful script execution can read or alter browser-accessible data.

The record

CVE
CVE-2023-21570
Published
Feb 14, 2023
Updated
Aug 19, 2026
Vendor
Microsoft
Product
Microsoft Dynamics 365 (on-premises) version 9.1
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 14, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record 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=9.0 <9.1.16.20

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Dynamics 365 (on-premises) version 9.1version=9.0 <9.1.16.20
Microsoft · Microsoft Dynamics 365 (on-premises) version 9.0version=9.0.0 <9.0.45.11

Published CVSS scores

5.4Microsoft CorporationCVSS: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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