CVE-2026-24299
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 M365 Copilot allows an unauthorized attacker to disclose information 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 · high confidenceM365 Copilot contains a command injection vulnerability where special elements in commands are not properly neutralized, allowing an unauthorized attacker to inject malicious commands and disclose information over a network. This is a remote, unauthenticated vulnerability in Microsoft's Copilot service.
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
- High
- Privileges
- None
- User interaction
- Required
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/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 M365 Copilot is enabled in your tenantSign into Microsoft 365 admin center, navigate to Settings > Services & add-ins, or use Microsoft 365 compliance center to check if Copilot for Microsoft 365 is provisioned and active for your organizationAffected if Copilot is enabled or has been used in your tenant - you are affected since all versions are vulnerable
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Review Copilot interaction logsCheck Microsoft 365 audit logs (Search > Audit or use Microsoft Purview compliance portal) for Copilot-related activities. Look for unusual or unexpected prompt patterns that may indicate injection attemptsAffected if You find logs of Copilot commands containing unexpected special characters, shell metacharacters, or patterns suggesting command injection attempts
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Check for data exfiltration indicatorsReview Microsoft 365 data loss prevention (DLP) alerts and exchange mail flow rules for unusual outbound data patterns that coincide with Copilot usage timestampsAffected if You observe unexpected data access or exfiltration patterns connected to Copilot session activity
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Monitor Microsoft security response centerVisit aka.ms/msrc or search Microsoft Security Response Center for CVE-2026-24299 to confirm the vulnerability status and any vendor-provided detection guidanceAffected if Microsoft confirms the vulnerability affects M365 Copilot and you are using the service
If your organization has M365 Copilot enabled or has used it, you are affected by this vulnerability since all versions are impacted; the risk is present until Microsoft releases a security update.
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's security updates for M365 Copilot as they become available. Monitor Microsoft's security response center for patch releases and verify that affected Copilot instances are updated.
- Consultation2.0 h
- Testing1.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,200.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-24299 — 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-2026-24299 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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