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the-40-thieves/obsidian-tc · Security

obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback

GHSA ID
GHSA-pqh8-4pj7-32xx
CVE ID
CVE-2026-77363
Severity
critical
Published
Updated
CVSS
9.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CVSS v3
9.6 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Description

Impact

The Streamable HTTP transport was constructed without enableDnsRebindingProtection/allowedHosts/allowedOrigins and performed no Origin-header validation. With the documented auth.mode: "none" loopback default, a drive-by web page could POST http://127.0.0.1/mcp and receive caller http-local with scopes ["*"] — full vault read/write — via DNS rebinding / a forged Origin.

Patches

Fixed in 1.3.1. Upgrade to >= 1.3.1. The transport now enables DNS-rebinding protection and allowed hosts/origins and returns HTTP 403 on an invalid Origin (per MCP 2025-11-25).

Workarounds

Do not expose the HTTP transport with auth.mode: "none"; require JWT auth, or bind to a non-loopback interface behind a proxy that validates Origin.

CWEs

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

References

Open GitHub