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Critical

Flowise Sandbox Escape to RCE

Type: advisorySources: OSV

Flowise is a drag-and-drop user interface for building customized large language model (LLM) flows. Prior to version 3.1.3, several custom-tool components — AgentAsTool, ChatflowTool, and ExecuteFlow — ran code in the in-process vm2 sandbox. To build that code, they inserted a user-controlled baseURL value straight into the JavaScript source, for example const url = "${baseURL}/..."; . The only check on baseURL was isValidURL , but a valid-looking URL can still contain characters that break out of a code string. An authenticated user could craft a baseURL that passed this check, closed the surrounding string, and injected their own JavaScript into the sandboxed script (code injection, CWE-94). The vm2 sandbox runs in the same Node.js process as Flowise and exposes risky dependencies. As a result, the injected code could escape the sandbox and run arbitrary code on the Flowise server as the Flowise process user. Exploitation only requires an authenticated session. The issue is fixed in version 3.1.3, which passes the URL to the sandbox as data instead of inserting it into code and adds stricter URL validation.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-69253
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 12:30 UTC · Revision 1

Source evidence

Flowise Sandbox Escape to RCE

core-osv · Original source

Published 4 Aug 2026, 15:13 UTC

Flowise is a drag-and-drop user interface for building customized large language model (LLM) flows. Prior to version 3.1.3, several custom-tool components — AgentAsTool, ChatflowTool, and ExecuteFlow — ran code in the in-process vm2 sandbox. To build that code, they inserted a user-controlled baseURL value straight into the JavaScript source, for example const url = "${baseURL}/..."; . The only check on baseURL was isValidURL , but a valid-looking URL can still contain characters that break out of a code string. An authenticated user could craft a baseURL that passed this check, closed the surrounding string, and injected their own JavaScript into the sandboxed script (code injection, CWE-94). The vm2 sandbox runs in the same Node.js process as Flowise and exposes risky dependencies. As a result, the injected code could escape the sandbox and run arbitrary code on the Flowise server as the Flowise process user. Exploitation only requires an authenticated session. The issue is fixed in version 3.1.3, which passes the URL to the sandbox as data instead of inserting it into code and adds stricter URL validation.

osv:CVE-2026-69253
Complete source record
{
  "id": "b5a3b6e2105fe06fc95c6b0e0796609658e486494f4085a144eb29bd820031a4",
  "url": "https://osv.dev/vulnerability/CVE-2026-69253",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Flowise Sandbox Escape to RCE",
    "summary": "Flowise is a drag-and-drop user interface for building customized large language model (LLM) flows. Prior to version 3.1.3, several custom-tool components — AgentAsTool, ChatflowTool, and ExecuteFlow — ran code in the in-process vm2 sandbox. To build that code, they inserted a user-controlled baseURL value straight into the JavaScript source, for example const url = \"${baseURL}/...\"; . The only check on baseURL was isValidURL , but a valid-looking URL can still contain characters that break out of a code string. An authenticated user could craft a baseURL that passed this check, closed the surrounding string, and injected their own JavaScript into the sandboxed script (code injection, CWE-94). The vm2 sandbox runs in the same Node.js process as Flowise and exposes risky dependencies. As a result, the injected code could escape the sandbox and run arbitrary code on the Flowise server as the Flowise process user. Exploitation only requires an authenticated session. The issue is fixed in version 3.1.3, which passes the URL to the sandbox as data instead of inserting it into code and adds stricter URL validation.",
    "evidence": "osv:CVE-2026-69253",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-69253",
      "aliases": [
        "CVE-2026-69253",
        "GHSA-wg86-r78f-74mp"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/flowiseai/flowise",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "09f099dbfda179e439ec677d06ad737375899eef"
                },
                {
                  "fixed": "3f257bdc8196082a178da7134a075824401b13b9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.1.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3f257bdc8196082a178da7134a075824401b13b9"
                      }
                    ],
                    "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-2026-69253.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.559474989Z",
      "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-2026-69253.json",
        "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-wg86-r78f-74mp",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-69253",
        "https://github.com/FlowiseAI/Flowise/commit/3f257bdc8196082a178da7134a075824401b13b9",
        "https://github.com/FlowiseAI/Flowise/pull/6417"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-95"
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        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/69xxx/CVE-2026-69253.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-69253",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495411,
  "published_at": "2026-08-04T15:13:39.181+00:00"
}