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Vulnerability record · CVE-2026-58201 · published 15 September 2026

CVE-2026-58201: Server-side request forgery (SSRF) vulnerability

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.

8.7 CVSS 4.0 High EPSS 0.48% · top 61.1% CWE-918 · Server-side request forgery (SSRF) Received
8.7CVSS 4.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
15 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/merill/lokka/commit/babead878f44cc2face2f8ee55d8b706e420947e
https://github.com/merill/lokka/pull/47
https://github.com/merill/lokka/security/advisories/GHSA-g2gw-q38m-vjfc

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Source: NIST National Vulnerability Database (record CVE-2026-58201), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.