CVE-2026-26118Network attack vector

Privilege escalation via unvalidated service URLs

Published Mar 10, 2026 · Updated Mar 10, 2026

SSRF in Azure MCP Server allows remote authenticated users to elevate privileges through crafted Kusto or resource-health tool input. KustoClient accepts an arbitrary cluster URI and sends authenticated queries to its host, while ResourceHealthService builds request paths from an unparsed resource ID. Low-privileged access can make the server contact internal endpoints, including Azure instance metadata, from its trusted network and credential context.

CVSS severity8.8
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSRF in Azure MCP Server allows remote authenticated users to elevate privileges through crafted Kusto or resource-health tool input. KustoClient accepts an arbitrary cluster URI and sends authenticated queries to its host, while ResourceHealthService builds request paths from an unparsed resource ID. Low-privileged access can make the server contact internal endpoints, including Azure instance metadata, from its trusted network and credential context.

The record

CVE
CVE-2026-26118
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Microsoft
Product
Azure MCP Server
Classifications
CWE-918, T1210
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.0 <2.0.0-beta.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Azure MCP Serverversion=1.0.0 <2.0.0-beta.17

Published CVSS scores

8.8Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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