{"id":"CVE-2026-77363","state":"PUBLISHED","title":"obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access","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.","publishedAt":"2026-10-12T17:45:57.107Z","updatedAt":"2026-10-13T16:03:13.858Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["The-40-Thieves obsidian-tc"],"affected":[{"vendor":"The-40-Thieves","product":"obsidian-tc","versions":[{"version":"< 1.3.1","status":"affected"}]}],"references":["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"],"weaknesses":["CWE-346","CWE-1385"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77363.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77363","state":"PUBLISHED","datePublished":"2026-10-12T17:45:57.107Z","dateUpdated":"2026-10-13T16:03:13.858Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T19:28:35.245Z"},"containers":{"cna":{"title":"obsidian-tc Streamable HTTP transport permits cross-origin loopback vault access","descriptions":[{"lang":"en","value":"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":[{"vendor":"The-40-Thieves","product":"obsidian-tc","versions":[{"version":"< 1.3.1","status":"affected"}]}],"references":[{"url":"https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx","name":"https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/pull/74","name":"https://github.com/The-40-Thieves/obsidian-tc/pull/74","tags":["x_refsource_MISC"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928","name":"https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928","tags":["x_refsource_MISC"]},{"url":"https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1","name":"https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":8.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-1385","lang":"en","description":"CWE-1385: Missing Origin Validation in WebSockets","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-12T17:45:57.107Z"},"source":{"advisory":"GHSA-pqh8-4pj7-32xx","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T16:02:58.070125Z","id":"CVE-2026-77363","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T16:03:13.858Z"}}]}}}