Azure MCP Server Tools 特権昇格の脆弱性

The SSRF vulnerability in Azure MCP Server Tools allows an attacker who has legitimate access to the system to craft malicious requests that appear to originate from the server itself. This can be exploited to access internal resources that are otherwise protected, such as cloud storage, databases, or other internal services. Successful exploitation could lead to data breaches, unauthorized modifications, or even complete compromise of the affected environment. The ability to elevate privileges significantly increases the potential impact, allowing an attacker to move laterally within the network and potentially gain control of other systems.

Organizations heavily reliant on Azure MCP Server Tools for management and automation are at significant risk. Specifically, environments with less stringent network segmentation and those using older, unpatched versions of the tool are particularly vulnerable. Shared hosting environments utilizing Azure MCP Server Tools should also be considered at higher risk due to the potential for cross-tenant exploitation.

• azure / server:

# Check for vulnerable versions of Azure MCP Server Tools
Get-AzVM | Where-Object {$_.Extensions | Where-Object {$_.Name -eq 'VMAzMCP'}}.Version -like '1.0.0-2.0.0-beta.17'

• generic web:

# Check for unusual outbound requests in access logs
grep -i -E 'https?://[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}:[0-9]+' /var/log/nginx/access.log

1. 2026-03-10Disclosure

   disclosure

1. 予約済み2026-02-11
2. 公開日2026-03-10
3. 更新日2026-04-14
4. EPSS 更新日2026-03-23

The primary mitigation for CVE-2026-26118 is to immediately upgrade Azure MCP Server Tools to version 2.0.0-beta.17 or later. If upgrading is not immediately feasible, consider implementing network segmentation to restrict the server's access to sensitive internal resources. Additionally, configure a Web Application Firewall (WAF) or proxy to filter outbound requests and block suspicious patterns indicative of SSRF attacks. Regularly review and audit network configurations to identify and address any potential vulnerabilities.