CVE-2026-42895
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 neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering 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 confidenceCommand injection vulnerability in Microsoft Copilot where improper neutralization of special elements allows an unauthorized attacker to inject arbitrary commands. The attack enables tampering over a network without authentication.
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 dataall versionsCVSS 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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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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Verify Microsoft 365 Copilot is enabledCheck Microsoft 365 admin center under 'Settings > Apps' or review Copilot license assignment in Microsoft 365 admin portalAffected if Copilot license is assigned or Copilot features appear in the Microsoft 365 interface
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Confirm Copilot integration in Microsoft 365 applicationsOpen any Microsoft 365 application (Word, Excel, Teams, Outlook) and look for the Copilot icon or Copilot pane in the ribbonAffected if Copilot feature is present and accessible in any Microsoft 365 application
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Identify Copilot API or plugin usageReview installed Microsoft 365 add-ins or plugins via 'Insert > Get Add-ins' in Office apps, or check Microsoft 365 compliance center for Copilot usage logsAffected if Copilot plugins or extensions are installed or Copilot activity is logged
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Check network exposure of Copilot servicesReview network logs for connections to *.copilot.microsoft.com or related Microsoft 365 Copilot endpointsAffected if Outbound traffic to Copilot endpoints is observed from the environment
If Microsoft 365 Copilot is present and active in the environment, the user is affected since all versions are vulnerable to command injection per the CVE.
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.
From vendor dataImplement strict input validation and sanitization for all user-supplied data before processing. Employ parameterized APIs or safe abstraction layers to prevent command injection. Apply principle of least privilege to limit Copilot's system access.
- Consultation8.0 h
- Implementation16.0 h
- Testing12.0 h
- Review / QA8.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $12,352.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-42895 — 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-2026-42895 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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- 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
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