critical9.6
CVE-2026-77363
obsidian-tc HTTP transport lacks Origin/DNS-rebinding protection, enabling drive-by vault access on loopback
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | obsidian-tc | < 1.3.1 | 1.3.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-pqh8-4pj7-32xx
- https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx
- https://github.com/The-40-Thieves/obsidian-tc/pull/74
- https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928
- https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1
- https://nvd.nist.gov/vuln/detail/cve-2026-77363