-40-Thieves obsidian-tc up to 1.3.0 Tool Dispatch input.vault access control

Summaryinfo

A vulnerability identified as critical has been detected in -40-Thieves obsidian-tc up to 1.3.0. This affects an unknown function of the component Tool Dispatch. This manipulation of the argument input.vault causes access control. The identification of this vulnerability is CVE-2026-77366. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in -40-Thieves obsidian-tc up to 1.3.0. It has been declared as critical. Affected by this vulnerability is some unknown functionality of the component Tool Dispatch. The manipulation of the argument input.vault with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-77366 since 08/20/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 1.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• -40-Thieves

Name

• obsidian-tc

Version

• 1.0
• 1.1
• 1.2
• 1.3.0

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CPE 2.2info

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