CVE-2026-77363

obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access

State: Published
Severity: 8.8 High
Published: Oct 12, 2026
Updated: Oct 13, 2026
Reserved: Aug 20, 2026

Description

obsidian-tc is a governed, agent-ready Model Context Protocol server for Obsidian vaults. Prior to 1.3.1, the Streamable HTTP transport does not validate the Host or Origin header or enable DNS-rebinding protection. When the documented loopback configuration uses auth.mode set to none, a malicious web page can send requests to the local MCP endpoint and receive unrestricted vault access through the http-local caller. Version 1.3.1 fixes the vulnerability by enabling host, origin, and DNS-rebinding validation.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-346 Origin Validation Error
CWE-1385 Missing Origin Validation in WebSockets

Affected Products

Product	Versions
obsidian-tcThe-40-Thieves	< 1.3.1Affected

References

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