CVE-2025-59528Known exploitationPublic exploitNetwork attack vector

Remote code execution via unsafe configuration evaluation

Published Sep 22, 2025 · Updated Sep 22, 2025

Code injection in Flowise 3.0.5 allows remote attackers to execute arbitrary JavaScript on the server through a crafted CustomMCP configuration. The CustomMCP convertToValidJSONString function passes the mcpServerConfig value directly to the Function() constructor, evaluating it with full Node.js privileges. The published proof of concept uses an API token, although the CVSS assessment records no privileges required; successful exploitation grants command and file-system access.

CVSS severity10.0
Critical
EPSS probability86.22%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Flowise 3.0.5 allows remote attackers to execute arbitrary JavaScript on the server through a crafted CustomMCP configuration. The CustomMCP convertToValidJSONString function passes the mcpServerConfig value directly to the Function() constructor, evaluating it with full Node.js privileges. The published proof of concept uses an API token, although the CVSS assessment records no privileges required; successful exploitation grants command and file-system access.

The record

CVE
CVE-2025-59528
Published
Sep 22, 2025
Updated
Sep 22, 2025
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-94, T1190, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 3.0.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

FlowiseAI · Flowiseversion== 3.0.5

Published CVSS scores

10.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1190Exploit Public-Facing Application
T1059.007JavaScript/JScript

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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