Critical Remote Code Execution Vulnerability in Flowise AI: CVE-2025-59528
In September 2025, a critical remote code execution (RCE) vulnerability, identified as CVE-2025-59528, was discovered in Flowise AI's version 3.0.5. This flaw resided in the CustomMCP node, which improperly executed user-supplied JavaScript code without validation, granting attackers full Node.js runtime privileges. Exploitation of this vulnerability could lead to complete system compromise, unauthorized command execution, and data exfiltration. Flowise addressed this issue by releasing version 3.0.6, which rectified the vulnerability. ([nvd.nist.gov](https://nvd.nist.gov/vuln/detail/CVE-2025-59528?utm_source=openai)) As of April 2026, active exploitation of CVE-2025-59528 has been observed, with over 12,000 Flowise instances exposed to potential attacks. This resurgence underscores the critical need for organizations to ensure their systems are updated to the latest secure versions to mitigate such high-severity threats. ([thehackernews.com](https://thehackernews.com/2026/04/flowise-ai-agent-builder-under-active.html?utm_source=openai))
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