obsidian-tc symlink path mismatch bypasses read ACL restrictions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77361
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-13 14:17:42 UTC
Updated2026-10-16 22:17:55 UTC
Descriptionobsidian-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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.001130000 probability, percentile 0.013210000 (date 2026-10-16)

Problem Types: CWE-59 | CWE-863 | CWE-59 CWE-59: Improper Link Resolution Before File Access ('Link Following') | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The-40-Thieves Obsidian-tc affected < 1.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/The-40-Thieves/obsidian-tc/commit/c81d1687e2cfec98a0d8bc5038c... [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/pull/76 [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-c5xx-h28h... [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 [email protected] github.com
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