CVE-2026-40933

{"id": "CVE-2026-40933", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40933", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-22T13:20:05.790341Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.9, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 3.1}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "FlowiseAI", "product": "Flowise", "versions": [{"status": "affected", "version": "< 3.1.0"}]}, {"vendor": "FlowiseAI", "product": "flowise-components", "versions": [{"status": "affected", "version": "< 3.1.0"}]}]}], "published": "2026-04-21T22:16:19.383", "references": [{"url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c9gw-hvqq-f33r", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem", "tags": ["Press/Media Coverage", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp", "tags": ["Press/Media Coverage", "Third Party Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c9gw-hvqq-f33r", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-78"}]}], "descriptions": [{"lang": "en", "value": "Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, due to unsafe serialization of stdio commands in the MCP adapter, an authenticated attacker can add an MCP stdio server with an arbitrary command, achieving command execution. The vulnerability lies in a bug in the input sanitization from the \u201cCustom MCP\u201d configuration in http://localhost:3000/canvas - where any user can add a new MCP, when doing so - adding a new MCP using stdio, the user can add any command, even though your code have input sanitization checks such as validateCommandInjection and validateArgsForLocalFileAccess, and a list of predefined specific safe commands - these commands, for example \"npx\" can be combined with code execution arguments (\"-c touch /tmp/pwn\") that enable direct code execution on the underlying OS. This vulnerability is fixed in 3.1.0."}, {"lang": "es", "value": "Flowise es una interfaz de usuario de arrastrar y soltar para construir un flujo de modelo de lenguaje grande personalizado. Antes de la versi\u00f3n 3.1.0, debido a la serializaci\u00f3n insegura de comandos stdio en el adaptador MCP, un atacante autenticado puede a\u00f1adir un servidor stdio MCP con un comando arbitrario, logrando la ejecuci\u00f3n de comandos. La vulnerabilidad reside en un error en la sanitizaci\u00f3n de entrada de la configuraci\u00f3n \u2019Custom MCP\u2019 en http://localhost:3000/canvas - donde cualquier usuario puede a\u00f1adir un nuevo MCP, al hacerlo - a\u00f1adiendo un nuevo MCP usando stdio, el usuario puede a\u00f1adir cualquier comando, a pesar de que su c\u00f3digo tiene comprobaciones de sanitizaci\u00f3n de entrada como validateCommandInjection y validateArgsForLocalFileAccess, y una lista de comandos seguros espec\u00edficos predefinidos - estos comandos, por ejemplo \u2019npx\u2019 pueden combinarse con argumentos de ejecuci\u00f3n de c\u00f3digo (\u2019-c touch /tmp/pwn\u2019) que permiten la ejecuci\u00f3n directa de c\u00f3digo en el sistema operativo subyacente. Esta vulnerabilidad est\u00e1 corregida en la versi\u00f3n 3.1.0."}], "lastModified": "2026-10-26T22:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CB30DB8F-4F72-4FD3-90FB-8331F1CBB78E", "versionEndExcluding": "3.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}