CVE-2025-59528
CriticalExploitedPublic exploitFlowise has Remote Code Execution vulnerability
Published Sep 15, 2025 · Updated Aug 12, 2026 · Also known as GHSA-3gcm-f6qx-ff7p
Key Facts
Patch immediately- CVE-2025-59528 is a critical-severity vulnerability (CVSS 10.0 v3.1) affecting Flowise (Flowiseai).
- It is exploited in the wild, listed in Industry KEV feed since Apr 5, 2026. Public exploit code is available.
- EPSS estimates a 86% probability of exploitation in the next 30 days.
- Fixed versions are available, including Flowise 3.0.6.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
10.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
86%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
1 catalog listing
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-59528 brief as a PDF
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 5, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FlowiseFlowiseai | 3.0.5, >= 3.0.5, >= = 3.0.5 | 3.0.6 |
Patched Releases
Flowise
3.0.6
Timeline
Publicly disclosed
Sep 15, 2025
Added to Industry KEV feed
Apr 5, 2026
Last updated
Aug 12, 2026
Weakness Type
- CWE-94 Improper Control of Generation of Code ('Code Injection')
References
- advisoryGHSA advisory
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2025/59xxx/CVE-2025-59528.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-59434
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-59528
- advisoryUSOM advisory
FAQ
Common Questions.
Flowise is a drag & drop user interface to build a customized large language model flow.
Affected: Flowise (Flowiseai) versions 3.0.5, >= 3.0.5, >= = 3.0.5. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 5, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Flowise 3.0.6.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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