GHSA-3gcm-f6qx-ff7p · Severity: critical · Ecosystem: npm — 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.
Conclusion & alert: CVE-2025-59528 is rated High Exploit Risk (94.9/100): CVSS Critical severity, with high exploitation likelihood (EPSS 90.37%, 100th percentile). Core evidence: 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +5.10% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 52440 | exploit_db | edb | 2025-10-31 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 85.27% | 90.37% | +5.10% |
| 2 | 2026-06-07 | 86.20% | 85.27% | -0.94% |
| 3 | 2026-06-02 | — | 86.20% | — |
Full EPSS history (23 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 10.0 | 3.1 | CRITICAL |
|
3.9 | 6.0 | [email protected] |
GHSA-3gcm-f6qx-ff7p · Severity: critical · Ecosystem: npm — Flowise has Remote Code Execution vulnerability