{"id":"CVE-2026-77363","sourceIdentifier":"security-advisories@github.com","published":"2026-10-12T18:17:23.513","lastModified":"2026-10-16T20:04:29.760","vulnStatus":"Deferred","cveTags":[],"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":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"The-40-Thieves","product":"obsidian-tc","versions":[{"version":"< 1.3.1","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-13T16:02:58.070125Z","id":"CVE-2026-77363","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-346"},{"lang":"en","value":"CWE-1385"}]}],"references":[{"url":"https://github.com/The-40-Thieves/obsidian-tc/commit/6428bfe6fdfd43aa7b4b369be3aecd6a268fb928","source":"security-advisories@github.com"},{"url":"https://github.com/The-40-Thieves/obsidian-tc/pull/74","source":"security-advisories@github.com"},{"url":"https://github.com/The-40-Thieves/obsidian-tc/releases/tag/v1.3.1","source":"security-advisories@github.com"},{"url":"https://github.com/The-40-Thieves/obsidian-tc/security/advisories/GHSA-pqh8-4pj7-32xx","source":"security-advisories@github.com"}]}