CVE-2026-77363: CWE-346: Origin Validation Error in The-40-Thieves obsidian-tc
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.
CVSS v3.1
Score 8.8high
Affected software
The-40-Thieves
obsidian-tc
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-08-20T19:28:35.245Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acd21152cdf04f656bc8da3
Added to database: 10/12/2026, 18:04:05 UTC
Last updated: 10/12/2026, 18:04:05 UTC
Views: 1
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