Vulnerability-Lookup

GHSA-84C9-QQPQ-2PQ5

Vulnerability from github – Published: 2026-10-23 17:29 – Updated: 2026-10-23 17:29

Summary

obsidian-tc tokens can access arbitrary configured vaults

Details

Impact

Tool dispatch did not check the caller-supplied input.vault against the caller's bound vault (ctx.vaultId); the folder ACL was a single global instance and the JWT carried no vault claim. As a result, any valid token could read, write, or delete any configured vault by passing input.vault, defeating multi-tenant isolation across ~90 tool sites. (resources/read was the only surface that already guarded this.)

Patches

Fixed in 1.3.1 (the fix was developed on the v1.3.0 tag, which never published to npm; 1.3.1 is the first published release with the fix). Upgrade to >= 1.3.1.

Workarounds

Run a single vault per server process, or isolate each tenant on a separate process/credential.

Fix

A central input.vault === ctx.vaultId guard was added in dispatch before the scope check.

Severity

9.9 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "obsidian-tc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77366"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-23T17:29:17Z",
    "nvd_published_at": "2026-10-12T18:17:23Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\nTool dispatch did not check the caller-supplied `input.vault` against the caller\u0027s bound vault (`ctx.vaultId`); the folder ACL was a single global instance and the JWT carried no vault claim. As a result, **any valid token could read, write, or delete any configured vault** by passing `input.vault`, defeating multi-tenant isolation across ~90 tool sites. (`resources/read` was the only surface that already guarded this.)\n\n### Patches\nFixed in **1.3.1** (the fix was developed on the `v1.3.0` tag, which never published to npm; 1.3.1 is the first published release with the fix). Upgrade to `\u003e= 1.3.1`.\n\n### Workarounds\nRun a single vault per server process, or isolate each tenant on a separate process/credential.\n\n### Fix\nA central `input.vault === ctx.vaultId` guard was added in dispatch before the scope check.",
  "id": "GHSA-84c9-qqpq-2pq5",
  "modified": "2026-10-23T17:29:17Z",
  "published": "2026-10-23T17:29:17Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-84c9-qqpq-2pq5"
    },
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/pull/72"
    },
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/commit/38b4992e87dc2715564236e1a42d005ab05a0194"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/The-40-Thieves/obsidian-tc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/cve-2026-77366"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "obsidian-tc tokens can access arbitrary configured vaults"
}

CVE-2026-77366 (GCVE-0-2026-77366)

Vulnerability from cvelistv5 – Published: 2026-10-12 17:54 – Updated: 2026-10-13 15:14

Title

obsidian-tc tokens can access arbitrary configured vaults

Summary

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, tool dispatch does not compare the caller-controlled input.vault value with the vault bound to the caller, the JSON Web Token (JWT) has no vault claim, and the folder access-control list is shared globally. Any valid token can therefore select another configured vault and read, write, or delete its contents through affected tools. Version 1.3.1 fixes the vulnerability by binding tokens and request context to a vault and rejecting mismatched input.vault values before scope checks.

Severity

9.9 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-13 15:14 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key
CWE-863 - Incorrect Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7858 records in the last 180 days details

References

4 references

URL	Tags
https://github.com/The-40-Thieves/obsidian-tc/sec…	x_refsource_CONFIRM
https://github.com/The-40-Thieves/obsidian-tc/pull/72	x_refsource_MISC
https://github.com/The-40-Thieves/obsidian-tc/com…	x_refsource_MISC
https://github.com/The-40-Thieves/obsidian-tc/rel…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
The-40-Thieves	obsidian-tc	Affected: < 1.3.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-77366",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-13T15:14:24.356255Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-13T15:14:30.957Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "obsidian-tc",
          "vendor": "The-40-Thieves",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.3.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, tool dispatch does not compare the caller-controlled input.vault value with the vault bound to the caller, the JSON Web Token (JWT) has no vault claim, and the folder access-control list is shared globally. Any valid token can therefore select another configured vault and read, write, or delete its contents through affected tools. Version 1.3.1 fixes the vulnerability by binding tokens and request context to a vault and rejecting mismatched input.vault values before scope checks."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.9,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "CWE-639: Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-863",
              "description": "CWE-863: Incorrect Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-12T17:54:31.642Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-84c9-qqpq-2pq5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-84c9-qqpq-2pq5"
        },
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/pull/72",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/pull/72"
        },
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/commit/38b4992e87dc2715564236e1a42d005ab05a0194",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/commit/38b4992e87dc2715564236e1a42d005ab05a0194"
        },
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1"
        }
      ],
      "source": {
        "advisory": "GHSA-84c9-qqpq-2pq5",
        "discovery": "UNKNOWN"
      },
      "title": "obsidian-tc tokens can access arbitrary configured vaults"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-77366",
    "datePublished": "2026-10-12T17:54:31.642Z",
    "dateReserved": "2026-08-20T19:36:13.804Z",
    "dateUpdated": "2026-10-13T15:14:30.957Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
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.

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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.
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