CVE-2026-77366: CWE-639: Authorization Bypass Through User-Controlled Key in The-40-Thieves obsidian-tc
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.
CVSS v3.1
Score 9.9critical
Affected software
The-40-Thieves
obsidian-tc
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:36:13.804Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acd21152cdf04f656bc8d9f
Added to database: 10/12/2026, 18:04:05 UTC
Last updated: 10/12/2026, 18:04:05 UTC
Views: 1
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