CVE-2026-77363 (GCVE-0-2026-77363)
Vulnerability from cvelistv5 – Published: 2026-10-12 17:45 – Updated: 2026-10-13 16:03
VLAI
EPSS
VEX
Title
obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
Summary
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-13 16:02 UTC
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/The-40-Thieves/obsidian-tc/sec… | x_refsource_CONFIRM |
| https://github.com/The-40-Thieves/obsidian-tc/pull/74 | x_refsource_MISC |
| https://github.com/The-40-Thieves/obsidian-tc/com… | x_refsource_MISC |
| https://github.com/The-40-Thieves/obsidian-tc/rel… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| The-40-Thieves | obsidian-tc |
Affected:
< 1.3.1
|
guessed |
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Nomenclature
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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