CVE-2026-46442
published 2026-06-08CVE-2026-46442: Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks…
PriorityP191critical9.9CVSS 3.1
AVNACLPRLUINSCCHIHAH
ITWEXPLOITVulnCheck KEV
Exploited in the wild
EPSS
36.34%
98.4th percentile
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| flowiseai | flowise | < 3.1.2 | 3.1.2 |
| flowiseai | flowise | >= 0 < 3.1.2 | 3.1.2 |
| flowiseai | flowise | >= 0 < 3.1.3 | 3.1.3 |
| flowiseai | flowise-components | >= 0 < 3.1.3 | 3.1.3 |
CVSS provenance
nvdv3.19.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvdv4.09.4CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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
vulncheck9.9CRITICAL
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GHSA
Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
ghsa·2026-08-04
CVE-2026-69255 [CRITICAL] CWE-94 Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
## 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
VulDB
FlowiseAI Flowise up to 3.1.1 node-custom-function code injection
vuldb·2026-06-08·CVSS 9.4
CVE-2026-46442 [CRITICAL] FlowiseAI Flowise up to 3.1.1 node-custom-function code injection
A vulnerability was found in FlowiseAI Flowise up to 3.1.1. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the file /api/v1/node-custom-function. The manipulation leads to code injection.
This vulnerability is referenced as CVE-2026-46442. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is advised.
GHSA
FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
ghsa·2026-05-14
CVE-2026-46442 [CRITICAL] CWE-94 FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
FlowiseAI: Authenticated Host RCE via POST /api/v1/node-custom-function and NodeVM Sandbox Escape
### Summary
`POST /api/v1/node-custom-function` lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the `Custom JS Function` node.
When `E2B_APIKEY` is not configured — the common deployment case — Flowise executes this code inside a `NodeVM` sandbox. This sandbox can be escaped, allowing an attacker to reach the host `process` object and execute system commands via `child_process`.
The result is authenticated remote code execution on the Flowise server host. CVSS v3.1: `AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H` = **9.9 Critical**.
### Details
Two distinct security boundaries are violated.
**1. Missing route-level authorization**
`pa
VulnCheck
FlowiseAI Flowise Improper Control of Generation of Code ('Code Injection')
vulncheck·2026·CVSS 9.9
CVE-2026-46442 [CRITICAL] FlowiseAI Flowise Improper Control of Generation of Code ('Code Injection')
FlowiseAI Flowise Improper Control of Generation of Code ('Code Injection')
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.
Affected: FlowiseAI Flowise
Required Action: Apply remediations
No detection rules found.
Nuclei
Flowise < 3.1.2 - node-custom-function Unauthorized RCE
nuclei·CVSS 9.9
CVE-2026-46442 [CRITICAL] Flowise < 3.1.2 - node-custom-function Unauthorized RCE
Flowise < 3.1.2 - node-custom-function Unauthorized RCE
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox. This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.
Template:
id: CVE-2026-46442
info:
name: Flowise < 3.1.2 - node-custom-function Una
No writeups or analysis indexed.
2026-06-08
Published
Exploited in the wild