{"id":"CVE-2026-77339","title":"Process Compose is a scheduler and orchestrator for non-containerized applications","summary":"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 …","severity":"medium","cvss":5.1,"cvssVector":"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","cwe":["CWE-306","CWE-346"],"vendor":"f1bonacc1","product":"github.com/f1bonacc1/process-compose","affected":["github.com/f1bonacc1/process-compose < 1.120.0"],"patched":["github.com/f1bonacc1/process-compose 1.120.0"],"published":"2026-09-18","updated":"2026-09-18","sourceUpdated":"2026-09-18T17:17:00.663","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77339","references":[{"url":"https://github.com/F1bonacc1/process-compose/commit/6ffa74f462cd2fa4f8dc1ee63c70b793b298c858","label":"security-advisories@github.com"},{"url":"https://github.com/F1bonacc1/process-compose/releases/tag/v1.120.0","label":"security-advisories@github.com"},{"url":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","label":"security-advisories@github.com"},{"url":"https://github.com/F1bonacc1/process-compose/security/advisories/GHSA-5gm3-9crp-6g3v","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/advisories/GHSA-5gm3-9crp-6g3v"},{"url":"https://github.com/F1bonacc1/process-compose"}],"tags":["nvd","ghsa","go","cve.org","exploit-available","osv"],"aliases":["GHSA-5gm3-9crp-6g3v"],"ecosystem":"go","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-18T16:49:18.961229Z"},"cvssSource":"cna","ingestedAt":"2026-09-18T16:45:41.405Z","epss":0.00214,"epssPercentile":0.12005,"slug":"CVE-2026-77339","body":"## Overview\n\nProcess 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-77339)\n\nAffected packages:\n\n- `github.com/f1bonacc1/process-compose < 1.120.0`\n\nPatched in:\n\n- `github.com/f1bonacc1/process-compose 1.120.0`\n\nSource: https://github.com/advisories/GHSA-5gm3-9crp-6g3v","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":28.1,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":207055,"id":"CVE-2026-77339","ts":1789753641534,"field":"exploit_available","old":"false","new":"true"}]}