CVE-2026-77366

obsidian-tc tokens can access arbitrary configured vaults

State
Published
Severity
9.9 Critical
Published
Oct 12, 2026
Updated
Oct 13, 2026
Reserved
Aug 20, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.19.9 CriticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HGitHub_M

Weaknesses

  • CWE-639 Authorization Bypass Through User-Controlled Key
  • CWE-863 Incorrect Authorization

Affected Products

ProductVersions
obsidian-tcThe-40-Thieves
  • < 1.3.1Affected

References

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