Vulnerability-Lookup

CVE-2026-69263 (GCVE-0-2026-69263)

Vulnerability from cvelistv5 – Published: 2026-08-04 16:54 – Updated: 2026-08-04 17:20

Title

Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

Summary

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the mitigation for CVE-2025-8943 blocked -y and --yes flags on npx, but packages/components/nodes/tools/MCP/core.ts denied only PATH, LD_LIBRARY_PATH, DYLD_LIBRARY_PATH, and NODE_OPTIONS by exact environment-variable name. Because npm reads configuration from npm_config_* variables, setting npm_config_yes=true reproduced --yes behavior without using a blocked flag, causing npx to auto-install and execute the named package when a Custom MCP server launched. This issue is fixed in version 3.1.3.

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-04 17:20 UTC

CWE

CWE-184 - Incomplete List of Disallowed Inputs

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/FlowiseAI/Flowise/security/adv…	x_refsource_CONFIRM
https://github.com/FlowiseAI/Flowise/pull/6471	x_refsource_MISC
https://github.com/FlowiseAI/Flowise/commit/a4c4e…	x_refsource_MISC
https://github.com/FlowiseAI/Flowise/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
FlowiseAI	Flowise	Affected: < 3.1.3

Show details on NVD website

JSON

To clipboard

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EUVD-2026-344159

European Vulnerability Database identifier assigned by ENISA

Reserved

2026-10-02 07:55

Assigner

ENISA

Alias of

a CVE record, shown under related vulnerabilities. This identifier carries no description, severity or references of its own: they belong to that CVE.

JSON

To clipboard

{
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  "date_reserved": "2026-10-02T07:55:57.855980+00:00",
  "id": "EUVD-2026-344159"
}

FKIE_CVE-2026-69263

Vulnerability from fkie_nvd - Published: 2026-08-04 17:17 - Updated: 2026-09-14 19:24

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351	Patch
security-advisories@github.com	https://github.com/FlowiseAI/Flowise/pull/6471	Issue Tracking, Patch
security-advisories@github.com	https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3	Patch, Release Notes
security-advisories@github.com	https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw	Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	flowiseai	flowise	*

JSON

To clipboard

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          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-69263",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-08-04T17:20:09.751060Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-08-04T17:17:01.683",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Issue Tracking",
        "Patch"
      ],
      "url": "https://github.com/FlowiseAI/Flowise/pull/6471"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch",
        "Release Notes"
      ],
      "url": "https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-184"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-XC48-889X-5QMW

Vulnerability from github – Published: 2026-08-04 17:09 – Updated: 2026-08-04 17:09

Summary

Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)

Details

Summary

The mitigation shipped for CVE-2025-8943 blocks the -y and --yes flags on npx to stop auto-installation of arbitrary packages. That flag filter works. The environment-variable check in the same patch denies only four variable names by exact string match, and npm reads its configuration directly from npm_config_* environment variables. Setting npm_config_yes=true reproduces the --yes behaviour the flag filter is meant to prevent, so npx auto-installs and executes the named package. The mitigation is fully bypassed.

This works with the MCP security check enabled (CUSTOM_MCP_SECURITY_CHECK=true). On a default Flowise deployment, which ships with no authentication, the result is unauthenticated remote code execution.

Root cause

The patch treats this as a flag-filtering problem, but the behaviour gated by --yes is also reachable through npm's environment-based configuration. The same is true for the other permitted interpreters, node and python3. A denylist of variable names cannot enumerate every environment variable that alters execution, so the control is incomplete by construction. The fix is to allowlist (or strip) the environment before it reaches the child process, not to extend the denylist.

Affected version

Flowise 3.1.1, current as of 2026-03-29.

Details

Validation happens in packages/components/nodes/tools/MCP/core.ts. Two functions run in sequence before any MCP server launches: validateCommandFlags and validateEnvironmentVariables.

validateCommandFlags is thorough. It blocks -y and --yes along with a comprehensive set of dangerous flags across npx, node, python, python3, and docker. That part of the patch is sound.

The gap is in validateEnvironmentVariables:

export const validateEnvironmentVariables = (env: Record<string, any>): void => {
    const dangerousEnvVars = ['PATH', 'LD_LIBRARY_PATH', 'DYLD_LIBRARY_PATH', 'NODE_OPTIONS']
    for (const [key, value] of Object.entries(env)) {
        if (dangerousEnvVars.includes(key)) {
            throw new Error(`Environment variable '${key}' modification is not allowed`)
        }
        if (typeof value === 'string' && value.includes('\0')) {
            throw new Error(`Environment variable '${key}' contains null byte`)
        }
    }
}

The blocklist is a hardcoded four-item array checked by exact match. Any variable not in that list passes through unchecked. npm_config_yes is npm's documented mechanism for setting the yes config via the environment. Set to true, it causes npx to auto-install without prompting, which is exactly what the -y and --yes flag blocks are intended to prevent.

Proof of concept

The following MCP server configuration bypasses the patch with CUSTOM_MCP_SECURITY_CHECK=true:

{
  "mcpServers": {
    "bypass": {
      "command": "npx",
      "args": ["malicious-package"],
      "env": {
        "npm_config_yes": "true"
      }
    }
  }
}

Execution path:

validateCommandFlags passes, because args contains no blocked flags.
validateEnvironmentVariables passes, because npm_config_yes is not in the four-item blocklist.
npx auto-installs and executes the named package with the privileges of the Flowise process.

On a default deployment with no authentication, any unauthenticated user who can reach the Flowise API can trigger this.

Additional bypass vectors (same root cause)

The following variables are also absent from the blocklist and influence execution through the other permitted interpreters:

Variable	Command	Effect
`npm_config_prefix`	`npx`	Redirects package installation to attacker-controlled path
`npm_config_userconfig`	`npx`	Loads attacker-controlled `.npmrc` configuration
`NODE_PATH`	`node`	Loads modules from attacker-controlled path
`PYTHONPATH`	`python3`	Loads modules from attacker-controlled path
`PYTHONSTARTUP`	`python3`	Executes a file on interpreter startup (interactive sessions only)

Impact

Full remote code execution with the privileges of the Flowise process. On default deployments with no authentication, no credentials are required.

Remediation

Strip the env object before passing it to the child process, or replace the name blocklist with an allowlist of explicitly permitted variables.

Adding the known dangerous variables to the blocklist (npm_config_yes, npm_config_prefix, npm_config_userconfig, NODE_PATH, PYTHONPATH, PYTHONSTARTUP) narrows the immediate gap but is a stopgap. Any future permitted interpreter reintroduces the same class of bypass.

References

CVE-2025-8943
CWE-184: Incomplete List of Disallowed Inputs

Severity

8.7 (High)


                  
                    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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.1.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "flowise"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 3.1.2"
      },
      "package": {
        "ecosystem": "npm",
        "name": "flowise-components"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-69263"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-184"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-04T17:09:48Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nThe mitigation shipped for CVE-2025-8943 blocks the `-y` and `--yes` flags on `npx` to stop auto-installation of arbitrary packages. That flag filter works. The environment-variable check in the same patch denies only four variable names by exact string match, and `npm` reads its configuration directly from `npm_config_*` environment variables. Setting `npm_config_yes=true` reproduces the `--yes` behaviour the flag filter is meant to prevent, so `npx` auto-installs and executes the named package. The mitigation is fully bypassed.\n\nThis works with the MCP security check enabled (`CUSTOM_MCP_SECURITY_CHECK=true`). On a default Flowise deployment, which ships with no authentication, the result is unauthenticated remote code execution.\n\n## Root cause\n\nThe patch treats this as a flag-filtering problem, but the behaviour gated by `--yes` is also reachable through `npm`\u0027s environment-based configuration. The same is true for the other permitted interpreters, `node` and `python3`. A denylist of variable names cannot enumerate every environment variable that alters execution, so the control is incomplete by construction. The fix is to allowlist (or strip) the environment before it reaches the child process, not to extend the denylist.\n\n## Affected version\n\nFlowise 3.1.1, current as of 2026-03-29.\n\n## Details\n\nValidation happens in `packages/components/nodes/tools/MCP/core.ts`. Two functions run in sequence before any MCP server launches: `validateCommandFlags` and `validateEnvironmentVariables`.\n\n`validateCommandFlags` is thorough. It blocks `-y` and `--yes` along with a comprehensive set of dangerous flags across `npx`, `node`, `python`, `python3`, and `docker`. That part of the patch is sound.\n\nThe gap is in `validateEnvironmentVariables`:\n\n```typescript\nexport const validateEnvironmentVariables = (env: Record\u003cstring, any\u003e): void =\u003e {\n    const dangerousEnvVars = [\u0027PATH\u0027, \u0027LD_LIBRARY_PATH\u0027, \u0027DYLD_LIBRARY_PATH\u0027, \u0027NODE_OPTIONS\u0027]\n    for (const [key, value] of Object.entries(env)) {\n        if (dangerousEnvVars.includes(key)) {\n            throw new Error(`Environment variable \u0027${key}\u0027 modification is not allowed`)\n        }\n        if (typeof value === \u0027string\u0027 \u0026\u0026 value.includes(\u0027\\0\u0027)) {\n            throw new Error(`Environment variable \u0027${key}\u0027 contains null byte`)\n        }\n    }\n}\n```\n\nThe blocklist is a hardcoded four-item array checked by exact match. Any variable not in that list passes through unchecked. `npm_config_yes` is npm\u0027s documented mechanism for setting the `yes` config via the environment. Set to `true`, it causes `npx` to auto-install without prompting, which is exactly what the `-y` and `--yes` flag blocks are intended to prevent.\n\n## Proof of concept\n\nThe following MCP server configuration bypasses the patch with `CUSTOM_MCP_SECURITY_CHECK=true`:\n\n```json\n{\n  \"mcpServers\": {\n    \"bypass\": {\n      \"command\": \"npx\",\n      \"args\": [\"malicious-package\"],\n      \"env\": {\n        \"npm_config_yes\": \"true\"\n      }\n    }\n  }\n}\n```\n\nExecution path:\n\n1. `validateCommandFlags` passes, because `args` contains no blocked flags.\n2. `validateEnvironmentVariables` passes, because `npm_config_yes` is not in the four-item blocklist.\n3. `npx` auto-installs and executes the named package with the privileges of the Flowise process.\n\nOn a default deployment with no authentication, any unauthenticated user who can reach the Flowise API can trigger this.\n\n## Additional bypass vectors (same root cause)\n\nThe following variables are also absent from the blocklist and influence execution through the other permitted interpreters:\n\n| Variable | Command | Effect |\n|---|---|---|\n| `npm_config_prefix` | `npx` | Redirects package installation to attacker-controlled path |\n| `npm_config_userconfig` | `npx` | Loads attacker-controlled `.npmrc` configuration |\n| `NODE_PATH` | `node` | Loads modules from attacker-controlled path |\n| `PYTHONPATH` | `python3` | Loads modules from attacker-controlled path |\n| `PYTHONSTARTUP` | `python3` | Executes a file on interpreter startup (interactive sessions only) |\n\n## Impact\n\nFull remote code execution with the privileges of the Flowise process. On default deployments with no authentication, no credentials are required.\n\n## Remediation\n\nStrip the `env` object before passing it to the child process, or replace the name blocklist with an allowlist of explicitly permitted variables.\n\nAdding the known dangerous variables to the blocklist (`npm_config_yes`, `npm_config_prefix`, `npm_config_userconfig`, `NODE_PATH`, `PYTHONPATH`, `PYTHONSTARTUP`) narrows the immediate gap but is a stopgap. Any future permitted interpreter reintroduces the same class of bypass.\n\n## References\n\n- CVE-2025-8943\n- CWE-184: Incomplete List of Disallowed Inputs",
  "id": "GHSA-xc48-889x-5qmw",
  "modified": "2026-08-04T17:09:48Z",
  "published": "2026-08-04T17:09:48Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/pull/6471"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/FlowiseAI/Flowise"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Flowise: CVE-2025-8943 Patch Bypass: npm_config_yes bypasses MCP environment variable blocklist (Unauthenticated RCE)"
}

WID-SEC-W-2026-2589

Vulnerability from csaf_certbund - Published: 2026-07-29 22:00 - Updated: 2026-09-09 22:00

Summary

Flowise: Mehrere Schwachstellen

Severity

Hoch

Scope

29 vulnerabilities in this advisory, including CVE-2026-69263.

CVE-2026-69263

Known affected: 1 product

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-69263 (GCVE-0-2026-69263)

EUVD-2026-344159

FKIE_CVE-2026-69263

GHSA-XC48-889X-5QMW

Summary

Root cause

Affected version

Details

Proof of concept

Additional bypass vectors (same root cause)

Impact

Remediation

References

WID-SEC-W-2026-2589

Tags

Sightings

Nomenclature

Related by attack behaviour