CVE-2026-77363

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928
https://github.com/The-40-Thieves/obsidian-tc/pull/74
https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1
https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx

Configurations

No configuration.

History

12 Oct 2026, 18:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-12 18:17

Updated : 2026-10-16 20:04

NVD link : CVE-2026-77363

Mitre link : CVE-2026-77363

CVE.ORG link : CVE-2026-77363

JSON object : View

Products Affected

No product.

CWE

CWE-346

Origin Validation Error

CWE-1385

Missing Origin Validation in WebSockets

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