{"id":"CVE-2026-77339","state":"PUBLISHED","title":"Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools","description":"Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0.","publishedAt":"2026-09-18T16:37:19.072Z","updatedAt":"2026-09-18T16:49:46.487Z","severity":{"score":5.1,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:H/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["F1bonacc1 process-compose"],"affected":[{"vendor":"F1bonacc1","product":"process-compose","versions":[{"version":"< 1.120.0","status":"affected"}]}],"references":["https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858","https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0"],"weaknesses":["CWE-306","CWE-346"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77339.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77339","state":"PUBLISHED","datePublished":"2026-09-18T16:37:19.072Z","dateUpdated":"2026-09-18T16:49:46.487Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-20T19:24:11.618Z"},"containers":{"cna":{"title":"Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools","descriptions":[{"lang":"en","value":"Process Compose is a scheduler and orchestrator for non-containerized applications. Prior to 1.120.0, the MCP SSE listener in src/mcp/server.go accepts browser-origin requests to /sse and the returned message endpoint without validating the Host header, validating the Origin header, or authenticating the caller. When MCP SSE is enabled, a malicious website can use DNS rebinding to reach the loopback listener and issue MCP requests. If expose_control_tools is enabled, the attacker can enumerate process state, read or search logs, truncate logs, and start, stop, restart, or scale local processes; configured user-defined tools can expose additional commands and output. The Gin REST API token middleware does not protect this separately started MCP listener. This issue is fixed in version 1.120.0."}],"affected":[{"vendor":"F1bonacc1","product":"process-compose","versions":[{"version":"< 1.120.0","status":"affected"}]}],"references":[{"url":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","name":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858","name":"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858","tags":["x_refsource_MISC"]},{"url":"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0","name":"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"HIGH","subAvailabilityImpact":"NONE","baseScore":5.1,"baseSeverity":"MEDIUM","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:H/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-306","lang":"en","description":"CWE-306: Missing Authentication for Critical Function","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-18T16:37:19.072Z"},"source":{"advisory":"GHSA-5gm3-9crp-6g3v","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-18T16:49:18.961229Z","id":"CVE-2026-77339","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-18T16:49:46.487Z"}}]}}}