{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-77339", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-08-20T19:24:11.618Z", "datePublished": "2026-09-18T16:37:19.072Z", "dateUpdated": "2026-09-18T16:49:46.487Z"}, "containers": {"cna": {"title": "Process Compose: Browser DNS rebinding lets websites control local process-compose MCP tools", "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"}]}], "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"}}], "references": [{"name": "https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v"}, {"name": "https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858", "tags": ["x_refsource_MISC"], "url": "https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858"}, {"name": "https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0"}], "affected": [{"vendor": "F1bonacc1", "product": "process-compose", "versions": [{"version": "< 1.120.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-18T16:37:19.072Z"}, "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."}], "source": {"advisory": "GHSA-5gm3-9crp-6g3v", "discovery": "UNKNOWN"}}, "adp": [{"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"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T16:49:46.487Z"}}]}}

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