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CVE-2026-77361— obsidian-tc symlink path mismatch bypasses read ACL restrictions

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 是一个为 Obsidian 仓库（vault）设计的、具备管控能力且兼容 Agent 的 Model Context Protocol（MCP）服务器。在版本 1.3.1 之前，读取访问控制列表（ACL）检查使用的是基于仓库的相对路径的字典序比较，而路径包含性（containment）检查则使用解析后的真实路径。因此，如果一个受允许的 glob 模式所允许的目录中存在指向被拒绝文件夹的符号链接（symlink），攻击者可以利用该符号链接绕过读取 ACL 限制，从而访问并暴露被拒绝文件夹中的文

CVSS 4.7 · Medium

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

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-2026-77361

Vulnerability Information
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Vulnerability Title
obsidian-tc symlink path mismatch bypasses read ACL restrictions
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, read access-control list (ACL) checks use a lexical vault-relative path while containment checks use the resolved path. An in-vault symlink under an allowed glob that resolves into a denied folder can therefore bypass the read ACL and expose files in the denied folder. Exploitation requires an out-of-band-planted symlink and does not permit an escape from the vault root. Version 1.3.1 fixes the vulnerability by applying ACL checks to the resolved vault-relative path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
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-2026-77361

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77361

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Patches & Fixes for CVE-2026-77361 (1)

Vendor Advisories for CVE-2026-77361 (1)

Proof of Concept for CVE-2026-77361 (1)

IV. Related Vulnerabilities

Same product: obsidian-tc
Same vendor: The-40-Thieves
Same weakness: CWE-59

V. Comments for CVE-2026-77361

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