CVE-2026-77363 json
obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access
published 2026-10-12 27 d ago modified 2026-10-23 16 d ago also GHSA-pqh8-4pj7-32xx , EUVD-2026-97733
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 4%
- public exploits
- 0
- none known
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.
Patch / fix
- npm obsidian-tc 1.3.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 27 d ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | obsidian-tc | <1.3.1 |
1.3.1 |
Affected products
- The-40-Thieves obsidian-tc
Classification
References
-
github.com
/The-40-Thieves/obsidian-tc/pull/74
web
-
github.com
/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928
web
-
github.com
/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx
web
-
github.com
/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1
web
-
github.com
/The-40-Thieves/obsidian-tc
package
-
nvd.nist.gov
/vuln/detail/cve-2026-77363
advisory
Sources
- CVE List CVE-2026-77363
- GitHub Advisory GHSA-pqh8-4pj7-32xx
- NVD CVE-2026-77363
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