CVE-2026-77366

obsidian-tc tokens can access arbitrary configured vaults

Published Oct 12, 2026 CVSS 3.1 · 9.9 Critical EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-84c9-qqpq-2pq5 obsidian-tc tokens can access arbitrary configured vaults
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared The-40-thieves
The-40-thieves obsidian-tc
Vendors & Products The-40-thieves
The-40-thieves obsidian-tc
Type Values Removed Values Added
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.
Title obsidian-tc tokens can access arbitrary configured vaults
Weaknesses CWE-639
CWE-863
References
Metrics cvssV3_1

{'score': 9.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 13, 2026, 3:14 PM
Reserved
Aug 20, 2026, 7:36 PM
Status
Awaiting Analysis
Published
Oct 12, 2026, 6:17 PM
Modified
Oct 16, 2026, 4:00 PM