{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-56274","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","state":"PUBLISHED","assignerShortName":"VulnCheck","dateReserved":"2026-06-20T01:47:54.000Z","datePublished":"2026-06-23T12:13:00.703Z","dateUpdated":"2026-06-24T11:17:02.895Z"},"containers":{"cna":{"providerMetadata":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-06-24T11:17:02.895Z"},"datePublic":"2026-05-14T00:00:00.000Z","title":"Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess","descriptions":[{"lang":"en","value":"Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host."}],"problemTypes":[{"descriptions":[{"lang":"en","description":"Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","cweId":"CWE-78","type":"CWE"}]}],"affected":[{"vendor":"Flowise","product":"Flowise","defaultStatus":"unaffected","packageURL":"pkg:npm/flowise","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"3.1.2"},{"version":"3.1.2","status":"unaffected","versionType":"semver"}]},{"vendor":"Flowise","product":"Flowise Components","defaultStatus":"unaffected","packageURL":"pkg:npm/flowise-components","versions":[{"version":"0","status":"affected","versionType":"semver","lessThan":"3.1.2"},{"version":"3.1.2","status":"unaffected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*","versionEndExcluding":"3.1.2"}]}]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"LOW","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m99r-2hxc-cp3q","name":"GitHub Security Advisory (GHSA-m99r-2hxc-cp3q)","tags":["vendor-advisory"]},{"name":"VulnCheck Advisory: Flowise - Remote Code Execution via MCP Security Bypass in validateCommandFlags and validateArgsForLocalFileAccess","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/flowise-remote-code-execution-via-mcp-security-bypass-in-validatecommandflags-and-validateargsforlocalfileaccess"}],"credits":[{"lang":"en","value":"cn-panda","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"references":[{"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-m99r-2hxc-cp3q","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-23T13:05:16.597724Z","id":"CVE-2026-56274","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-23T13:05:20.491Z"}}]}}