Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M

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

High 8.7

In plain English

A high-severity server-side request forgery in lokka from merill. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.5%top 58.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@merill/lokka	2.1.2	GHSA-g2gw-q38m-vjfc

Affected products (as reported)

Vendor	Product	Versions
merill	lokka	< 2.1.2

Weakness: CWE-918 · Vector: 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

References

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