CVE Catalog

CVE-2026-58201

HighCVSS 8.7
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.48%

39th percentile - higher than 39% of all known CVEs

Summary

In the Lokka-Microsoft tool (an MCP server for Microsoft 365) prior to 2.1.2, a user-controlled path value is directly concatenated to the management.azure.com base URL. A specially crafted path can alter URL authority parsing and cause an Azure Resource Manager bearer token to be sent to an unintended host.

Risk Assessment

An attacker could capture the Azure Resource Manager bearer token, enabling unauthorized access to Azure resources in the victim's context. This may lead to modification or disclosure of data within the Azure subscription.

Recommendation

Upgrade Lokka to version 2.1.2 or later. Until then, restrict access to the tool and monitor for unusual outbound requests to hosts other than management.azure.com.

Related vulnerabilities

Original NVD description (English source)

Lokka is a Model Context Protocol server for Microsoft 365, including Microsoft Graph and other services. Prior to 2.1.2, the Lokka-Microsoft tool in src/mcp/src/main.ts uses direct URL string concatenation to append the user-controlled path value to the management.azure.com base URL. A specially crafted path can alter URL authority parsing and cause an Azure Resource Manager bearer token to be sent to an unintended host. This issue is fixed in version 2.1.2.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS