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Critical

Flowise - Unsandboxed Remote Code Execution via Custom MCP

Type: advisorySources: OSV

Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-71336
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 18:13 UTC · Revision 1

Source evidence

Flowise - Unsandboxed Remote Code Execution via Custom MCP

core-osv · Original source

Published 25 Jun 2026, 21:41 UTC

Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.

osv:CVE-2025-71336
Complete source record
{
  "id": "ab3afc289f1c1cc0c6d7298ca5e3bffc7598c87952b9624ce98a19bad972dd75",
  "url": "https://osv.dev/vulnerability/CVE-2025-71336",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flowise - Unsandboxed Remote Code Execution via Custom MCP",
    "summary": "Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.",
    "evidence": "osv:CVE-2025-71336",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-71336",
      "aliases": [
        "CVE-2025-71336",
        "GHSA-6933-jpx5-q87q"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flowiseai/flowise",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "89a0f23fe5e9c0b1ee85ee1175032c6b9e5ac9c1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.0.6"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.0.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
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            "flowise-ui@3.0.5",
            "flowise-components@3.0.5",
            "flowise@3.0.4",
            "flowise-ui@3.0.4",
            "flowise-components@3.0.4",
            "flowise@3.0.3",
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            "flowise@3.0.2",
            "flowise-ui@3.0.2",
            "flowise-components@3.0.2",
            "flowise@3.0.1",
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            "flowise-components@2.1.4",
            "flowise@2.1.3",
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            "flowise-components@2.1.3",
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            "flowise-ui@2.0.3",
            "flowise-components@2.0.3",
            "flowise@2.0.2",
            "flowise-ui@2.0.2",
            "flowise-components@2.0.2",
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            "flowise@1.7.2",
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            "flowise@1.7.0",
            "flowise-ui@1.7.0",
            "flowise-components@1.7.0",
            "flowise@1.6.6",
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            "flowise@1.6.4",
            "flowise-ui@1.6.4",
            "flowise-components@1.6.6",
            "flowise@1.6.3",
            "flowise-ui@1.6.3",
            "flowise-components@1.6.5",
            "flowise@1.6.2",
            "flowise-ui@1.6.2",
            "flowise-components@1.6.4",
            "flowise@1.6.1",
            "flowise-ui@1.6.1",
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            "flowise-ui@1.6.0",
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            "flowise@1.5.0",
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            "flowise@1.4.6",
            "flowise-ui@1.4.4",
            "flowise-components@1.4.7",
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            "flowise-ui@1.4.3",
            "flowise@1.4.4",
            "flowise-ui@1.4.2",
            "flowise-components@1.4.6",
            "flowise@1.4.2",
            "flowise-components@1.4.2",
            "flowise@1.4.1",
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            "flowise@1.4.0",
            "flowise-ui@1.4.0",
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            "flowise@1.3.9",
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            "flowise@1.2.2",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-71336.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.046566588Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71336.json",
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-71336",
        "https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-via-custom-mcp"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-78"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71336.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-71336",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488161,
  "published_at": "2026-06-25T21:41:06.841+00:00"
}