Vulnerability-Lookup

GHSA-PQH8-4PJ7-32XX

Vulnerability from github – Published: 2026-10-23 18:29 – Updated: 2026-10-23 18:29

Summary

obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback

Details

Impact

The Streamable HTTP transport was constructed without enableDnsRebindingProtection/allowedHosts/allowedOrigins and performed no Origin-header validation. With the documented auth.mode: "none" loopback default, a drive-by web page could POST http://127.0.0.1/mcp and receive caller http-local with scopes ["*"] — full vault read/write — via DNS rebinding / a forged Origin.

Patches

Fixed in 1.3.1. Upgrade to >= 1.3.1. The transport now enables DNS-rebinding protection and allowed hosts/origins and returns HTTP 403 on an invalid Origin (per MCP 2025-11-25).

Workarounds

Do not expose the HTTP transport with auth.mode: "none"; require JWT auth, or bind to a non-loopback interface behind a proxy that validates Origin.

Severity

9.6 (Critical)


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

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JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "obsidian-tc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.3.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-77363"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-1385",
      "CWE-346"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-23T18:29:02Z",
    "nvd_published_at": "2026-10-12T18:17:23Z",
    "severity": "CRITICAL"
  },
  "details": "### Impact\nThe Streamable HTTP transport was constructed without `enableDnsRebindingProtection`/`allowedHosts`/`allowedOrigins` and performed no `Origin`-header validation. With the documented `auth.mode: \"none\"` loopback default, a **drive-by web page could `POST http://127.0.0.1/mcp`** and receive caller `http-local` with scopes `[\"*\"]` \u2014 full vault read/write \u2014 via DNS rebinding / a forged Origin.\n\n### Patches\nFixed in **1.3.1**. Upgrade to `\u003e= 1.3.1`. The transport now enables DNS-rebinding protection and allowed hosts/origins and returns HTTP 403 on an invalid Origin (per MCP 2025-11-25).\n\n### Workarounds\nDo not expose the HTTP transport with `auth.mode: \"none\"`; require JWT auth, or bind to a non-loopback interface behind a proxy that validates `Origin`.",
  "id": "GHSA-pqh8-4pj7-32xx",
  "modified": "2026-10-23T18:29:02Z",
  "published": "2026-10-23T18:29:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx"
    },
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/pull/74"
    },
    {
      "type": "WEB",
      "url": "https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928"
    },
    {
      "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-2026-77363"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback"
}

CVE-2026-77363 (GCVE-0-2026-77363)

Vulnerability from cvelistv5 – Published: 2026-10-12 17:45 – Updated: 2026-10-13 16:03

Title

obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access

Summary

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration uses auth.mode set to none, a malicious web page can send requests to the local MCP endpoint and receive unrestricted vault access through the http-local caller. Version 1.3.1 fixes the vulnerability by enabling host, origin, and DNS-rebinding validation.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 16:02 UTC

CWE

CWE-346 - Origin Validation Error
CWE-1385 - Missing Origin Validation in WebSockets

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/74	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-2026-77363",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-13T16:02:58.070125Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-13T16:03:13.858Z",
          "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, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration uses auth.mode set to none, a malicious web page can send requests to the local MCP endpoint and receive unrestricted vault access through the http-local caller. Version 1.3.1 fixes the vulnerability by enabling host, origin, and DNS-rebinding validation."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-346",
              "description": "CWE-346: Origin Validation Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-1385",
              "description": "CWE-1385: Missing Origin Validation in WebSockets",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-12T17:45:57.107Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx"
        },
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/pull/74",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/pull/74"
        },
        {
          "name": "https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928"
        },
        {
          "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-pqh8-4pj7-32xx",
        "discovery": "UNKNOWN"
      },
      "title": "obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-77363",
    "datePublished": "2026-10-12T17:45:57.107Z",
    "dateReserved": "2026-08-20T19:28:35.245Z",
    "dateUpdated": "2026-10-13T16:03:13.858Z",
    "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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