by Kastro
Paper/Archive/CVE-2026-77366

CVE-2026-77366

The-40-Thieves obsidian-tc — obsidian-tc tokens can access arbitrary configured vaults

EPSS 0.3%CVSS 9.9
critical.is priorityof 100
34
CVSS 9.9 (CNA)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 23.7.237 × 204.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
obsidian-tc< 1.3.1–CNA

Scores by source

GitHub_M (CNA)9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refgithub.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-84c9-qqpq-2pq5refgithub.com/The-40-Thieves/obsidian-tc/pull/72refgithub.com/The-40-Thieves/obsidian-tc/commit/38b4992e87dc2715564236e1a42d005ab05a0194refgithub.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1