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CVE-2025-71336— Flowise - Unsandboxed Remote Code Execution via Custom MCP

Quick assessment

Affected
Flowise 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公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.0.6之前版本存在命令注入漏洞，该漏洞源于Custom MCP功能缺乏沙箱隔离，且认证和授权模型薄弱缺少基于角色的访问控制，默认安装未设置FLOWISE_USERNAME和FLOWISE_PASSWORD时运行无需身份验证，导致攻击者可通过向/api/v1/node-load-method/customMCP端点发送带有'x-request-from: int

CVSS 9.8 · Critical EPSS 1.15% · P66

Affected Version Matrix 2

VendorProduct Version RangeStatus
Flowise Flowise < 3.0.6 affected
3.0.6 unaffected
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I. Basic Information for CVE-2025-71336

Vulnerability Information
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Vulnerability Title
Flowise - Unsandboxed Remote Code Execution via Custom MCP
Source: CVE Program / CVE List V5
Vulnerability Description
Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
FlowiseAI Flowise 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FlowiseAI Flowise是FlowiseAI公司开源的一个用于轻松构建 LLM 应用程序的工具。 FlowiseAI Flowise 3.0.6之前版本存在命令注入漏洞，该漏洞源于Custom MCP功能缺乏沙箱隔离，且认证和授权模型薄弱缺少基于角色的访问控制，默认安装未设置FLOWISE_USERNAME和FLOWISE_PASSWORD时运行无需身份验证，导致攻击者可通过向/api/v1/node-load-method/customMCP端点发送带有'x-request-from: int
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
Flowise Flowise 0 ~ 3.0.6 -

II. Public POCs for CVE-2025-71336

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6652 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-71336

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Vendor Advisories for CVE-2025-71336 (2)

Same Patch Batch · Flowise · 2026-06-25 · 8 CVEs total

CVE-2025-71338 10.0 CRITICAL Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store A
CVE-2025-71334 9.8 CRITICAL Flowise - Arbitrary File Access via Missing Chat Flow ID Validation
CVE-2025-71327 9.1 CRITICAL Flowise - Authentication Bypass via Unprotected Registration Endpoint
CVE-2025-71328 8.3 HIGH Flowise - Unverified Password Change via Account Settings
CVE-2025-71335 8.1 HIGH Flowise - Session Invalidation Failure After Password Change
CVE-2025-71324 7.5 HIGH Flowise - Arbitrary File Read via chatId Parameter
CVE-2025-71333 Flowise - Arbitrary File Upload via Unauthenticated /api/v1/attachments Endpoint

IV. Related Vulnerabilities

Same product: Flowise
Same vendor: Flowise
Same weakness: CWE-78

V. Comments for CVE-2025-71336

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