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CVE-2026-77366— obsidian-tc tokens can access arbitrary configured vaults

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 是一个面向 Obsidian 知识库（vault）、支持托管（governed）且具备代理就绪（agent-ready）特性的 Model Context Protocol 服务器。在版本 1.3.1 之前，工具调用分发机制未将调用方控制的输入参数 与调用方所绑定的知识库进行比对；JSON Web Token（JWT）中未包含知识库（vault）声明；并且文件夹访问控制列表在全局范围内共享。因此，任何有效的令牌均可选择其他已配置的知识库，并通过受影响的工具读取、写入或删除其内容。 版本 1.

CVSS 9.9 · Critical EPSS 0.31% · P22

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-2026-77366

Vulnerability Information
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Vulnerability Title
obsidian-tc tokens can access arbitrary configured vaults
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, 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
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-2026-77366

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III. Intelligence Information for CVE-2026-77366

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Patches & Fixes for CVE-2026-77366 (2)

Vendor Advisories for CVE-2026-77366 (1)

Proof of Concept for CVE-2026-77366 (1)

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

CVE-2026-77363 8.8 HIGH obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
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-639

V. Comments for CVE-2026-77366

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