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CVE-2026-73601— Flowise before 3.1.3 Remote Code Execution via Custom MCP

Quick assessment

Affected
FlowiseAI Flowise
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FlowiseAI Flowise是FlowiseAI公司开源的一款可视化编排语言模型应用流程的工具。 FlowiseAI Flowise 3.1.3之前版本存在代码注入漏洞，该漏洞源于Custom MCP节点在CUSTOM_MCP_PROTOCOL设置为stdio时存在远程代码执行漏洞，攻击者可通过操纵环境变量和命令参数绕过验证，可能导致已认证用户执行任意命令或系统命令。

CVSS 9.0 · Critical EPSS 1.10% · P64

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 4

VendorProduct Version RangeStatus
FlowiseAI Flowise < 3.1.3 affected
3.1.3 unaffected
< 3.1.3 affected
3.1.3 unaffected
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I. Basic Information for CVE-2026-73601

Vulnerability Information
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Vulnerability Title
Flowise before 3.1.3 Remote Code Execution via Custom MCP
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
动态执行代码中指令转义处理不恰当(Eval注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 代码注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一款可视化编排语言模型应用流程的工具。 FlowiseAI Flowise 3.1.3之前版本存在代码注入漏洞，该漏洞源于Custom MCP节点在CUSTOM_MCP_PROTOCOL设置为stdio时存在远程代码执行漏洞，攻击者可通过操纵环境变量和命令参数绕过验证，可能导致已认证用户执行任意命令或系统命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FlowiseAI Flowise 0 ~ 3.1.3 -
FlowiseAI Flowise 0 ~ 3.1.3 -

II. Public POCs for CVE-2026-73601

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6637 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-73601

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Vendor Advisories for CVE-2026-73601 (2)

Same Patch Batch · FlowiseAI · 2026-08-13 · 10 CVEs total

CVE-2026-73483 9.4 CRITICAL Flowise before 3.1.3 Sandbox Escape via Puppeteer
CVE-2026-73487 9.0 CRITICAL Flowise before 3.1.3 Prompt Injection RCE via CSV Agent
CVE-2026-73485 9.0 CRITICAL Flowise before 3.1.3 Remote Code Execution via Airtable Agent
CVE-2026-73486 9.0 CRITICAL Flowise before 3.1.3 Code Injection via CSV Agent customReadCSV
CVE-2026-73602 9.0 CRITICAL Flowise before 3.1.3 Sandbox Escape to RCE
CVE-2026-73484 8.6 HIGH Flowise before 3.1.3 Sandbox Escape via Pandas Methods
CVE-2026-73604 6.5 MEDIUM Flowise before 3.1.3 Credential Exposure via API
CVE-2026-73603 6.3 MEDIUM Flowise before 3.1.4 Credential Abuse via Text-to-Speech
CVE-2026-73488 6.0 MEDIUM Flowise before 3.1.3 IDOR via customer-default-source endpoint

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: FlowiseAI
Same weakness: CWE-95

V. Comments for CVE-2026-73601

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