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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-69263
Confirmed fixed CVEs
Not specified
Updated in this feed
6 Nov 2026, 02:39 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 4 Aug 2026, 16:54 UTC

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.

osv:CVE-2026-69263
Complete source record
{
  "id": "7c584f738afab258e7c6d1786ff79d7772fa331af4c628636ded99bb6ef379c6",
  "url": "https://osv.dev/vulnerability/CVE-2026-69263",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-69263",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-69263",
      "aliases": [
        "CVE-2026-69263",
        "GHSA-xc48-889x-5qmw"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flowiseai/flowise",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "09f099dbfda179e439ec677d06ad737375899eef"
                },
                {
                  "fixed": "a4c4e4988cded15edf725e762560575b889ae351"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "a4c4e4988cded15edf725e762560575b889ae351"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "09f099dbfda179e439ec677d06ad737375899eef"
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                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "flowise@3.1.3"
                  }
                ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-69263.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.177264865Z",
      "provider": "osv",
      "references": [
        "https://github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69263.json",
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-xc48-889x-5qmw",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-69263",
        "https://github.com/FlowiseAI/Flowise/commit/a4c4e4988cded15edf725e762560575b889ae351",
        "https://github.com/FlowiseAI/Flowise/pull/6471"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-184"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69263.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-69263",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514357,
  "published_at": "2026-08-04T16:54:36.893+00:00"
}