CVE-2021-41354Network attack vector

Authenticated script execution via undisclosed web input

Published Oct 13, 2021 · Updated Aug 4, 2024

Cross-site scripting in Microsoft Dynamics 365 (on-premises) before 9.0.31.7 or 9.1.4 allows remote authenticated users to alter web content. Microsoft has not disclosed the affected component, input field, or faulty neutralization operation that permits script injection. Exploitation requires low-privileged access and user interaction and can expose or modify data available to the victim's browser session.

CVSS severity5.4
Medium
EPSS probability0.95%
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 9.0.31.7 or 9.1.4 allows remote authenticated users to alter web content. Microsoft has not disclosed the affected component, input field, or faulty neutralization operation that permits script injection. Exploitation requires low-privileged access and user interaction and can expose or modify data available to the victim's browser session.

The record

CVE
CVE-2021-41354
Published
Oct 13, 2021
Updated
Aug 4, 2024
Vendor
Microsoft
Product
Microsoft Dynamics 365 (on-premises) version 9.1
Classifications
CWE-79, CAPEC-63, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 13, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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 <9.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Dynamics 365 (on-premises) version 9.1version=9.0 <9.1.4
Microsoft · Microsoft Dynamics 365 (on-premises) version 9.0version=9.0.0 <9.0.31.7

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
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 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')
CAPEC-63Cross-Site Scripting (XSS)
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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