CVE-2026-41090
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 allows unauthorized attackers to inject and execute arbitrary commands on the underlying system by improper neutralization of special elements in user input, enabling network-based tampering attacks.
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
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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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Confirm Microsoft 365 Copilot is enabled in your tenantSign in to Microsoft 365 admin center, navigate to Setup > Apps and services, or run Get-M365CopilotLicense in Microsoft Graph PowerShell to list licensed users with Copilot accessAffected if Copilot licenses are assigned and the service shows as enabled in your tenant
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Identify network-exposed Copilot interfacesReview your network perimeter configuration for any public-facing endpoints that provide Copilot access, including conditional access policies that allow remote access to Microsoft 365 Copilot servicesAffected if Copilot is accessible from untrusted networks without multi-factor authentication or VPN requirements
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Review sign-in logs for suspicious command patternsIn Microsoft 365 admin center, go to Defender > Audit > Sign-in logs, or use Search-UnifiedAuditLog with Copilot-related activities. Filter for anomalous IP addresses or unusual request patternsAffected if Audit logs show login attempts from unexpected locations or suspicious input patterns targeting Copilot prompts
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Check conditional access policies for CopilotNavigate to Microsoft Entra ID > Protection > Conditional Access and review policies targeting Copilot services. Verify that policies require compliant devices, trusted locations, or strong authenticationAffected if Conditional access policies are absent or allow broad access to Copilot without strict authentication controls
Your environment is affected if Microsoft 365 Copilot is enabled and accessible, since all versions of Copilot contain this command injection vulnerability.
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 dataApply Microsoft security updates for Copilot when available; implement strict input validation and sanitization for all user-supplied data processed by Copilot; restrict Copilot's system-level permissions to minimize impact of potential command injection.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-41090 — 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-2026-41090 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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