CVE-2026-26118: Azure.Mcp Azure MCP Server Has Server-Side Vulnerability
HIGHCVE-2026-26118 is a HIGH (CVSS 8.8) azure mcp server has server-side vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Azure.Mcp libraries in the NuGet ecosystem. The issue involves azure mcp server has server-side request forgery issue that allows authorized attacker to elevate privileges over a network. Remediation is available by upgrading affected packages to version 2.0.0-beta.17, 1.0.2, 2.0.0b17.
CVE-2026-26118 at a Glance
Security Impact
CVSS: 8.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-26118
To remediate this vulnerability, upgrade all affected Azure.Mcp dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade Azure.Mcp to 2.0.0-beta.17Upgrade Azure.Mcp to 1.0.2npm install @azure/mcp@2.0.0-beta.17pip install msmcp-azure>=2.0.0b17npm install @azure/mcp@1.0.2Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for Azure.McpHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-26118, inspect your project dependencies for Azure.Mcp:
inspect dependencies for Azure.McpAnalyze the terminal output to locate any version of Azure.Mcp in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.0.0-beta.17), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Azure.Mcp, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-26118 Affected Azure.Mcp Versions
5 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Azure.Mcp
|
NuGet |
≥ 2.0.0-beta.1
< 2.0.0-beta.17
|
2.0.0-beta.17
|
|
Azure.Mcp
|
NuGet |
≥ 1.0.0
< 1.0.2
|
1.0.2
|
|
@azure/mcp
|
npm |
≥ 2.0.0-beta.1
< 2.0.0-beta.17
|
2.0.0-beta.17
|
|
msmcp-azure
|
PyPI |
≥ 2.0.0b14
< 2.0.0b17
|
2.0.0b17
|
|
@azure/mcp
|
npm |
≥ 1.0.0
< 1.0.2
|
1.0.2
|
References
Frequently Asked Questions
What is CVE-2026-26118?
Which Azure.Mcp versions are affected?
What version fixes CVE-2026-26118?
Is Azure.Mcp affected?
Is @azure/mcp affected?
What is the CVSS score of CVE-2026-26118?
What CWE is associated with CVE-2026-26118?
How can I check NuGet dependencies for CVE-2026-26118?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-hhfx-wfvq-7g9c",
"modified" : "2026-03-12T19:53:06Z",
"published" : "2026-03-10T18:31:21Z",
"aliases" : [ "CVE-2026-26118" ],
"summary" : "Azure MCP Server has Server-Side Request Forgery issue that allows authorized attacker to elevate privileges over a network",
"details" : "Server-Side Request Forgery (SSRF) in Azure MCP Server allows an authorized attacker to elevate privileges over a network.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "NuGet",
"name" : "Azure.Mcp"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0-beta.1"
}, {
"fixed" : "2.0.0-beta.17"
} ]
} ]
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Azure.Mcp"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.0.0"
}, {
"fixed" : "1.0.2"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "@azure/mcp"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0-beta.1"
}, {
"fixed" : "2.0.0-beta.17"
} ]
} ]
}, {
"package" : {
"ecosystem" : "PyPI",
"name" : "msmcp-azure"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.0.0b14"
}, {
"fixed" : "2.0.0b17"
} ]
} ]
}, {
"package" : {
"ecosystem" : "npm",
"name" : "@azure/mcp"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "1.0.0"
}, {
"fixed" : "1.0.2"
} ]
} ]
} ],
"references" : [ {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-26118"
}, {
"type" : "WEB",
"url" : "https://github.com/microsoft/mcp/commit/804ff60293206c4d8e832f772097238561bf2c34"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/microsoft/mcp"
}, {
"type" : "WEB",
"url" : "https://github.com/microsoft/mcp/releases/tag/Azure.Mcp.Server-1.0.2"
}, {
"type" : "WEB",
"url" : "https://github.com/microsoft/mcp/releases/tag/Azure.Mcp.Server-2.0.0-beta.17"
}, {
"type" : "WEB",
"url" : "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26118"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-918" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-03-11T19:59:54Z",
"nvd_published_at" : "2026-03-10T18:18:41Z"
}
}