CVE-2026-77363 – obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access

​CVE ID :CVE-2026-77363

Published : Oct. 12, 2026, 6:17 p.m. | 14 minutes ago

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.

Severity: 8.8 | HIGH

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