---
id: CVE-2026-77363
title: >-
  obsidian-tc is a governed, agent-ready Model Context Protocol server for
  Obsidian vaults
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 l…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-346
  - CWE-1385
published: '2026-10-12'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T18:17:23.513'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77363'
references:
  - url: >-
      https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928
    label: security-advisories@github.com
  - url: 'https://github.com/The-40-Thieves/obsidian-tc/pull/74'
    label: security-advisories@github.com
  - url: 'https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-12T19:01:57.229Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.