CVE-2026-42898Network attack vector

Authenticated remote code execution

Published May 12, 2026 · Updated May 12, 2026

Code injection in Microsoft Dynamics 365 (on-premises) before 9.1.45.11 allows remote authenticated users to execute code. Microsoft has not disclosed the affected component, the untrusted input, or the operation that turns that input into executable code. Low-privileged credentials and network access are required; exploitation needs no user interaction and can compromise data and service availability.

CVSS severity9.9
Critical
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Microsoft Dynamics 365 (on-premises) before 9.1.45.11 allows remote authenticated users to execute code. Microsoft has not disclosed the affected component, the untrusted input, or the operation that turns that input into executable code. Low-privileged credentials and network access are required; exploitation needs no user interaction and can compromise data and service availability.

The record

CVE
CVE-2026-42898
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Microsoft
Product
Microsoft Dynamics 365 (on-premises) version 9.1
Classifications
CWE-94, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 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 <9.1.44.15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Microsoft Dynamics 365 (on-premises) version 9.1version=9.0 <9.1.44.15

Published CVSS scores

9.9Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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-94Improper Control of Generation of Code ('Code Injection')
T1210Exploitation of Remote Services

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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