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Azure Web AppsApplication · Microsoft

CVE-2026-32211

HIGH · 7.5 CVSS v3.1 Published 2026-04-03
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
84/100
Remediation priority · High
Remotely reachable No privileges Zero-click

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
Missing authentication for critical function in Azure MCP Server 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 · moderate confidence

Azure MCP Server contains a missing authentication vulnerability in a critical function that allows unauthenticated network attackers to access sensitive information. The CVSS vector indicates network exploitability (AV:N) with high attack complexity, suggesting the vulnerability requires specific conditions but remains remotely exploitable without credentials.

MitigationImplement robust authentication requirements for the affected critical function in Azure MCP Server, following least-privilege principles. Verify all network-accessible endpoints enforce proper authentication before allowing access to sensitive data or operations.

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
Azure Web AppsApplication
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
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

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

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

  1. Identify if Azure MCP Server is deployed
    Check your Azure Web App's deployed code, Kudu/SCM console, or App Service Editor for files related to 'mcp', 'McpServer', or Azure MCP Server components. Review your deployment pipeline or source code for MCP Server dependencies.
    Affected if Azure MCP Server is present in the Web App deployment
  2. Enumerate exposed MCP Server endpoints
    Review your application routing/configuration files (e.g., startup code, route definitions, proxy settings) to identify all endpoints or functions exposed by the Azure MCP Server. Use Azure Portal's 'API' section or network tracing to observe actual traffic.
    Affected if The MCP Server exposes any API endpoints or functions to the network
  3. Verify authentication is enforced on Web App
    In Azure Portal, go to your App Service > Authentication (Classic) or Identity. Check if 'Authentication' is enabled. Also verify the 'Anonymous access' setting under 'Authentication Providers'.
    Affected if Authentication is disabled or set to 'Allow Anonymous' without corresponding authorization logic protecting MCP Server functions
  4. Test unauthenticated access to MCP functions
    From an external host, send HTTP requests to the MCP Server endpoints discovered in step 2 without providing any authentication headers, tokens, or credentials. Use tools like curl or Postman.
    Affected if Requests succeed without authentication and return sensitive data or privileged operations
  5. Review MCP Server authorization configuration
    Inspect the MCP Server's configuration files or code for any authorization checks (e.g., role-based access, permission validation) on the critical functions. Look for [Authorize] attributes, policy checks, or manual authorization logic.
    Affected if No authorization checks exist or are bypassed for the critical function

Your environment is affected if an Azure MCP Server is deployed on your Web App and the critical function is accessible over the network without requiring authentication or valid authorization.

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 authentication requirements for the affected critical function in Azure MCP Server, following least-privilege principles. Verify all network-accessible endpoints enforce proper authentication before allowing access to sensitive data or operations.

Fix this in Azure Web Apps Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing4.0 h
  • Review / QA2.0 h
18.0 hours of engineering $3,200
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Scan for this in your stack

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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-2026-32211 in production — separate from our analysis above.

No notes yet

Be the first to add a field note for this CVE — a mitigation you’ve verified, a version caveat, or a link to a working fix. Sign in above to contribute.

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
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data