dbcve.org
Copilot StudioApplication · Microsoft

CVE-2024-49038

CRITICAL · 9.6 CVSS v3.1 Published 2024-11-26
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges

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 · unedited
Improper neutralization of input during web page generation ('Cross-site Scripting') in Copilot Studio by an unauthorized attacker leads to elevation of privilege 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 confidence

A Cross-site Scripting (XSS) vulnerability in Copilot Studio allows an unauthenticated attacker to inject malicious scripts into web pages generated by the application. This improper input neutralization enables the attacker to potentially escalate privileges by hijacking sessions or performing actions on behalf of authenticated users.

MitigationImplement robust input validation and contextual output encoding for all user-supplied data rendered in web pages. Additionally, deploy Content Security Policy (CSP) headers to mitigate XSS execution and conduct thorough penetration testing to verify the fix.

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
Copilot StudioApplication
Affected:all versions

CVSS 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
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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 checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Copilot Studio deployment
    Inventory your environment for Microsoft Copilot Studio installations by checking installed applications, Azure resources, or service registrations associated with this product.
    Affected if Copilot Studio is present in the environment and exposes a web interface.
  2. Identify Copilot Studio web endpoints
    Locate all publicly or internally accessible URLs serving Copilot Studio web pages, typically under paths like /copilot/ or /studio/ in your organization's web traffic logs or application gateway configurations.
    Affected if Copilot Studio web endpoints are accessible and accept user input.
  3. Inspect HTML output for unencoded input
    Submit test input containing special characters such as <script>alert(1)</script>, <img src=x onerror=alert(1)>, or " onclick=alert(1) to Copilot Studio web forms and chat interfaces, then view the page source or HTTP response to verify if these characters are rendered as plain text rather than encoded or stripped.
    Affected if User-supplied characters appear unescaped in the rendered HTML (e.g., < appears as < instead of &lt;).
  4. Review input validation configuration
    Examine Copilot Studio configuration files, Azure policy settings, or admin console options related to input sanitization, output encoding, or XSS protection settings.
    Affected if No input validation or output encoding protections are enabled or configured.
  5. Check for missing security headers
    Send HTTP requests to Copilot Studio endpoints and inspect response headers for the presence of Content-Security-Policy, X-XSS-Protection, or X-Content-Type-Options headers.
    Affected if Security headers designed to mitigate XSS are absent from HTTP responses.

A user is affected if Copilot Studio is deployed with an accessible web interface that reflects unencoded user input in its generated pages.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement robust input validation and contextual output encoding for all user-supplied data rendered in web pages. Additionally, deploy Content Security Policy (CSP) headers to mitigate XSS execution and conduct thorough penetration testing to verify the fix.

Fix this in Copilot Studio Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,224.

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-49038 in production — separate from our analysis above.

No notes yet

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What this is

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.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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