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CVE-2026-58201— Lokka: Azure Resource Manager URL path validation issue

Quick assessment

Affected
merill lokka
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Lokka 是一个为 Microsoft 365（包括 Microsoft Graph 及其他服务）提供的模型上下文协议（Model Context Protocol, MCP）服务器。在 2.1.2 版本之前，位于 中的 Lokka-Microsoft 工具通过直接拼接字符串的方式，将用户可控的路径值追加到 基础 URL 之后。经过特殊构造的路径可能会改变 URL 的权威部分（authority）解析，导致 Azure Resource Manager 的 Bearer 令牌被发送到非预期的主机。该问题已在 2.

CVSS 8.7 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-58201

Vulnerability Information
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Vulnerability Title
Lokka: Azure Resource Manager URL path validation issue
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
merill lokka < 2.1.2 -

II. Public POCs for CVE-2026-58201

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III. Intelligence Information for CVE-2026-58201

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Patches & Fixes for CVE-2026-58201 (2)

Vendor Advisories for CVE-2026-58201 (1)

IV. Related Vulnerabilities

Same weakness: CWE-918

V. Comments for CVE-2026-58201

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