CVE-2021-36950Network attack vector

Authenticated content spoofing

Published Aug 12, 2021 · Updated Aug 10, 2026

Cross-site scripting in Microsoft Dynamics 365 (on-premises) 9.0 before 9.0.30.2 allows remote authenticated users to spoof content. Microsoft has not published the affected endpoint, input field, or improper neutralization operation that produces the script-bearing output. Exploitation requires low-privileged access and victim interaction, enabling script execution in another user's browser with limited data exposure or modification.

CVSS severity5.4
Medium
EPSS probability1.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Microsoft Dynamics 365 (on-premises) 9.0 before 9.0.30.2 allows remote authenticated users to spoof content. Microsoft has not published the affected endpoint, input field, or improper neutralization operation that produces the script-bearing output. Exploitation requires low-privileged access and victim interaction, enabling script execution in another user's browser with limited data exposure or modification.

The record

CVE
CVE-2021-36950
Published
Aug 12, 2021
Updated
Aug 10, 2026
Vendor
Microsoft
Product
Microsoft Dynamics 365 (on-premises) version 9.0
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.30.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Dynamics 365 (on-premises) version 9.0version=9.0.0 <9.0.30.2

Published CVSS scores

4.9Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C
3.5NIST National Vulnerability DatabaseAV: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 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo