URL Manipulation Vulnerability in Lokka Server for Microsoft 365
CVE-2026-58201

8.7HIGH

Key Information:

Vendor

Merill

Status
Lokka
Vendor
CVE Published:
15 September 2026

What is CVE-2026-58201?

The Lokka Model Context Protocol server for Microsoft 365 is susceptible to a URL manipulation vulnerability. This issue arises in versions prior to 2.1.2, where the Lokka-Microsoft tool concatenates user-controlled path values directly to the management.azure.com base URL. A specially crafted path may allow an attacker to redirect Azure Resource Manager bearer tokens to an unintended host, potentially exposing sensitive information. It is crucial for users of Lokka to upgrade to version 2.1.2 to mitigate this security risk.

Affected Version(s)

lokka < 2.1.2

References

https://github.com/merill/lokka/security/advisories/GHSA-...
x_refsource_CONFIRM
https://github.com/merill/lokka/pull/47
x_refsource_MISC
https://github.com/merill/lokka/commit/babead878f44cc2fac...
x_refsource_MISC

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.