CVE-2026-26118 Azure MCP Server Tools Elevation of Privilege Vulnerability
An authorized attacker can exploit Server-Side Request Forgery in Azure MCP Server Tools to elevate privileges over the network.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-26118?
CVE-2026-26118 is a high-severity server-side request forgery vulnerability in Microsoft Azure MCP Server Tools 1.0.0 (NuGet), published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Server-side request forgery (ssrf) in Azure MCP Server allows an authorized attacker to elevate privileges over a network.
Weakness: CWE-918
Which versions are affected by CVE-2026-26118?
11 open source packages ship an affected version, including Azure.Mcp, msmcp-azure and @azure/mcp. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Azure.Mcp NuGet | From 1.0.0 | 1.0.2 |
Azure.Mcp NuGet | From 1.0.0 | 1.0.2 |
Azure.Mcp NuGet | From 2.0.0-beta.1 | 2.0.0-beta.17 |
Azure.Mcp NuGet | From 2.0.0-beta.1 | 2.0.0-beta.17 |
msmcp-azure PyPI | From 2.0.0b14 | 2.0.0b17 |
msmcp-azure PyPI | From 2.0.0b14 | 2.0.0b17 |
5 more packages
msmcp-azure PyPI | From 2.0.0b14 | 2.0.0b17 |
@azure/mcp npm | From 1.0.0 | 1.0.2 |
@azure/mcp npm | From 1.0.0 | 1.0.2 |
@azure/mcp npm | From 2.0.0-beta.1 | 2.0.0-beta.17 |
@azure/mcp npm | From 2.0.0-beta.1 | 2.0.0-beta.17 |
Products include Microsoft Azure Mcp Server.
How do I fix CVE-2026-26118?
Upgrade Azure.Mcp to a fixed version for your release line: 1.0.2 or 2.0.0-beta.17.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-26118 being exploited?
There is no known exploitation of CVE-2026-26118 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-hhfx-wfvq-7g9c, PYSEC-2026-2669.