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CVE-2026-77363— obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access

Quick assessment

Affected
The-40-Thieves obsidian-tc
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

obsidian-tc 是一个受管控、代理就绪的 Model Context Protocol（MCP）服务器，专为 Obsidian 笔记库（vaults）设计。在 1.3.1 版本之前，其 Streamable HTTP 传输层未验证 Host 或 Origin 请求头，也未启用 DNS 重绑定（DNS rebinding）防护机制。当文档中描述的本地回环（loopback）配置将 auth.mode 设置为 none 时，恶意网页可向本地 MCP 端点发送请求，并通过 http-local 调用者获得对笔记库

CVSS 8.8 · High EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
The-40-Thieves obsidian-tc < 1.3.1 affected
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I. Basic Information for CVE-2026-77363

Vulnerability Information
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Vulnerability Title
obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The-40-Thieves obsidian-tc < 1.3.1 -

II. Public POCs for CVE-2026-77363

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77363

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Patches & Fixes for CVE-2026-77363 (2)

Vendor Advisories for CVE-2026-77363 (1)

Proof of Concept for CVE-2026-77363 (1)

Same Patch Batch · The-40-Thieves · 2026-10-12 · 3 CVEs total

CVE-2026-77366 9.9 CRITICAL obsidian-tc tokens can access arbitrary configured vaults
CVE-2026-77364 6.5 MEDIUM obsidian-tc fail-open default ACL exposes Obsidian control-directory secrets

IV. Related Vulnerabilities

Same product: obsidian-tc
Same vendor: The-40-Thieves
Same weakness: CWE-346

V. Comments for CVE-2026-77363

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