CVE-2026-42898
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedImproper control of generation of code ('code injection') in Microsoft Dynamics 365 (on-premises) allows an authorized attacker to execute code over a network.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceA code injection vulnerability exists in Microsoft Dynamics 365 (on-premises) where the application improperly controls the generation of code, allowing an authenticated attacker to inject and execute arbitrary code remotely. This is a critical server-side code injection flaw that bypasses normal authorization boundaries once an attacker has valid credentials.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data>= 9.1.1.914, < 9.1.45.11CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Microsoft Dynamics 365 on-premises is installedLocate the Dynamics 365 installation directory or check installed programs on the server. This vulnerability affects on-premises deployments only, not Dynamics 365 Online.Affected if The environment is running Microsoft Dynamics 365 on-premises
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Identify the installed Dynamics 365 versionCheck the version by reviewing the assembly information in the CRM web application bin folder, the Deployment Manager, or the Microsoft Dynamics 365 installation logs. Common paths include the installation directory or registry keys under HKLM\Software\Microsoft\MSCRM.Affected if The installed version cannot be determined
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Compare installed version against affected rangeReview the version number against the affected range: versions 9.1.1.914 and higher through versions lower than 9.1.45.11 are vulnerable.Affected if The installed version falls within >= 9.1.1.914 and < 9.1.45.11
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Verify the specific build numberIn Dynamics 365, navigate to Settings > About, or check the version via PowerShell using Get-CrmServer or the Deployment Manager interface to confirm the exact build number.Affected if The exact build number is within the affected version range
A system is affected if it runs Microsoft Dynamics 365 on-premises with a version >= 9.1.1.914 and < 9.1.45.11.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped9.1.45.11
Apply Microsoft security patches for Dynamics 365 on-premises immediately. Review and restrict code generation functionalities, implement input validation, and consider network segmentation to limit exposure until patching is complete.
9.1.45.11 or later
- Identify current Dynamics 365 (on-premises) version by checking the installed application version
- Back up the Microsoft Dynamics 365 database and all customizations
- Schedule a maintenance window for the upgrade process
- Upgrade Microsoft Dynamics 365 (on-premises) to version 9.1.45.11 or later
- Verify the upgrade completed successfully by checking the version number
- Test critical business processes and workflows to ensure functionality is intact
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation6.0 h
- Implementation12.0 h
- Testing10.0 h
- Review / QA5.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $9,216.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42898 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-42898 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data