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Aakash Rahsi
Aakash Rahsi

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CVE-2026-26118 | Azure MCP Server Tools Elevation of Privilege Vulnerability

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CVE-2026-26118 — Azure MCP Server Tools — SSRF-driven privilege flow across trust boundary

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CVE-2026-26118 | Azure MCP Server Tools Elevation of Privilege Vulnerability

CVE-2026-26118 Azure MCP Server Tools elevation of privilege insight into execution context, trust boundaries, and access control.

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  • SSRF in Azure MCP Server Tools can influence privilege within network execution context
  • Affects Azure MCP Server Tools deployments and related package ecosystems
  • Patch immediately and review trust boundaries, egress, and RBAC posture

Executive Summary

Severity: High

Business Impact: Expanded data access, account context extension, service-to-service trust exposure

Exploitability: Possible — requires authorized access and network reachability

Action Window: Patch now — this sits near sensitive orchestration and tool invocation paths

What is the vulnerability

  • Type: Server-Side Request Forgery / Elevation of Privilege
  • Where: Azure MCP Server Tools
  • Trust Boundary: Network and identity boundary

This reflects how execution context and outbound request handling can align across a sensitive trust boundary in tool-driven cloud workflows.

Affected Scope

Area Details
Product Azure MCP Server Tools
Deployment Cloud / Hybrid
Packages @azure/mcp, Azure.Mcp, msmcp-azure
Preconditions Authorized access, reachable service path, exposed request-handling surface

Attack Narrative

An actor reaches a valid service surface.

The system processes an unintended server-side request within its intended execution context.

That request can align with internal trust assumptions.

Outcome: expanded capability across connected resources or privileged service paths.

Detection Guidance

  • Review service audit and admin activity logs
  • Monitor outbound requests from MCP service components
  • Watch for unusual internal destination access
  • Track unexpected privilege grants or tool actions

Risk Rating

Factor Score
Likelihood 4
Impact 4
Detectability 3
Overall High

Notes: Network-reachable SSRF in orchestration tooling raises trust-boundary sensitivity.

Stakeholder Impact

  • CISO Office
  • Cloud Security
  • DevSecOps
  • Platform Engineering

FAQ

  • Are we affected? → If Azure MCP Server Tools or listed packages are deployed
  • What changed? → Server-side request handling across a trust boundary
  • What are we doing? → Patching, reviewing egress, and tightening privilege paths

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