Vulnerability-Lookup

GHSA-G2GW-Q38M-VJFC

Vulnerability from github – Published: 2026-06-19 22:10 – Updated: 2026-06-19 22:10

Summary

Lokka: Azure Resource Manager URL path validation issue

Details

Lokka versions prior to 2.1.2 constructed Azure Resource Manager request URLs using direct string concatenation with user-controlled path input. Specially crafted path values could alter URL authority parsing and cause Azure Resource Manager bearer tokens to be sent to an unintended host. Version 2.1.2 fixes the issue by validating Azure paths before token acquisition and constructing Azure Resource Manager URLs with the standard URL API while preserving the expected management.azure.com host.

Reported by 정해창 haechang__@naver.com

Severity

8.7 (High)


                  
                    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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "@merill/lokka"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-918"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-19T22:10:39Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "Lokka versions prior to 2.1.2 constructed Azure Resource Manager request URLs using direct string concatenation with user-controlled path input. Specially crafted path values could alter URL authority parsing and cause Azure Resource Manager bearer tokens to be sent to an unintended host. Version 2.1.2 fixes the issue by validating Azure paths before token acquisition and constructing Azure Resource Manager URLs with the standard URL API while preserving the expected management.azure.com host.\n\nReported by \uc815\ud574\ucc3d \u003chaechang__@naver.com\u003e",
  "id": "GHSA-g2gw-q38m-vjfc",
  "modified": "2026-06-19T22:10:39Z",
  "published": "2026-06-19T22:10:39Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/merill/lokka/security/advisories/GHSA-g2gw-q38m-vjfc"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/merill/lokka"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Lokka: Azure Resource Manager URL path validation issue"
}

CVE-2026-58201 (GCVE-0-2026-58201)

Vulnerability from cvelistv5 – Published: 2026-09-15 16:48 – Updated: 2026-09-15 19:01

Title

Lokka: Azure Resource Manager URL path validation issue

Summary

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.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 19:01 UTC

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M mitre root Scorecard

References

3 references

URL	Tags
https://github.com/merill/lokka/security/advisori…	x_refsource_CONFIRM
https://github.com/merill/lokka/pull/47	x_refsource_MISC
https://github.com/merill/lokka/commit/babead878f…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
merill	lokka	Affected: < 2.1.2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-58201",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-15T19:01:34.903589Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-15T19:01:50.538Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "lokka",
          "vendor": "merill",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.2"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 8.7,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "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",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-918",
              "description": "CWE-918: Server-Side Request Forgery (SSRF)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T16:48:58.802Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/merill/lokka/security/advisories/GHSA-g2gw-q38m-vjfc",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/merill/lokka/security/advisories/GHSA-g2gw-q38m-vjfc"
        },
        {
          "name": "https://github.com/merill/lokka/pull/47",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/merill/lokka/pull/47"
        },
        {
          "name": "https://github.com/merill/lokka/commit/babead878f44cc2face2f8ee55d8b706e420947e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/merill/lokka/commit/babead878f44cc2face2f8ee55d8b706e420947e"
        }
      ],
      "source": {
        "advisory": "GHSA-g2gw-q38m-vjfc",
        "discovery": "UNKNOWN"
      },
      "title": "Lokka: Azure Resource Manager URL path validation issue"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-58201",
    "datePublished": "2026-09-15T16:48:58.802Z",
    "dateReserved": "2026-06-29T17:09:25.872Z",
    "dateUpdated": "2026-09-15T19:01:50.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-G2GW-Q38M-VJFC

CVE-2026-58201 (GCVE-0-2026-58201)

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