What is CVE-2026-26118?

CVE-2026-26118 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. Azure MCP Server Tools Elevation of Privilege Vulnerability

Which CVE IDs does CVE-2026-26118 cover?

CVE-2026-26118 covers the following CVE IDs: CVE-2026-26118. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-26118?

CVE-2026-26118 has a CVSS v3 base score of 8.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-26118?

CVE-2026-26118 affects 5 products, including: Azure MCP Server Tools 1.0.0 (NuGet); Azure MCP Server Tools 1.0.0 (npm); Azure MCP Server Tools 2.0.0 (NuGet); Azure MCP Server Tools 2.0.0 (PyPi); Azure MCP Server Tools 2.0.0 (npm).

CVE-2026-26118HighCVSS 8.8

Azure MCP Server Tools Elevation of Privilege Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-26118 →

📋 Description

Server-side request forgery (ssrf) in Azure MCP Server allows an authorized attacker to elevate privileges over a network.

🎯 Affected products5

Azure MCP Server Tools 1.0.0 (NuGet)
Azure MCP Server Tools 1.0.0 (npm)
Azure MCP Server Tools 2.0.0 (NuGet)
Azure MCP Server Tools 2.0.0 (PyPi)
Azure MCP Server Tools 2.0.0 (npm)

✅ Remediation

KBRelease Notes (Security Update) — fixed build 2.0.0-beta.17 KBRelease Notes (Security Update) — fixed build 1.0.2

🔗 References (7)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26118
patchhttps://www.nuget.org/packages/Azure.Mcp/2.0.0-beta.17
referencehttps://github.com/microsoft/mcp/blob/main/servers/Azure.Mcp.Server/CHANGELOG.md
patchhttps://www.npmjs.com/package/@azure/mcp/v/2.0.0-beta.17
patchhttps://pypi.org/project/msmcp-azure/2.0.0b17/
patchhttps://www.nuget.org/packages/Azure.Mcp/1.0.2
patchhttps://www.npmjs.com/package/@azure/mcp/v/1.0.2