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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77363
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-12 18:17:23 UTC
Updated2026-10-12 18:17:23 UTC
Descriptionobsidian-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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem Types: CWE-346 | CWE-1385 | CWE-346 CWE-346: Origin Validation Error | CWE-1385 CWE-1385: Missing Origin Validation in WebSockets

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA The-40-Thieves Obsidian-tc affected < 1.3.1 Not specified

References

ReferenceSourceLinkTags
github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3a... [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/pull/74 [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7... [email protected] github.com
github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1 [email protected] github.com
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