obsidian-tc symlink path mismatch bypasses read ACL restrictions

published 2026-10-13 27 d ago modified 2026-10-23 16 d ago also GHSA-c5xx-h28h-f682 , EUVD-2026-98694

cvss: 4.7; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

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.

Patch / fix

fixed in 1 links 3

npm obsidian-tc 1.3.1

github.com/The-40-Thieves/obsidian-tc@c81d168 commit
github.com/The-40-Thieves/obsidian-tc#76 pull request
github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 release

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 23 d ago (2026-10-16)

Exploit prediction

0.11% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
GitHub	3.1	4.7	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
npm	obsidian-tc	<1.3.1	1.3.1

Affected products

The-40-Thieves obsidian-tc

Classification

Weakness

CWE-59 Improper Link Resolution Before File Access
CWE-863 Incorrect Authorization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary