Flowise RCE (CVE-2026-40933) Puts AI Supply Chains at Risk
Obsidian Security has released a Proof-of-Concept for a critical Remote Code Execution (RCE) vulnerability in Flowise, tracked as CVE-2026-40933. Rated 9.9 CVSS, this flaw allows attackers to fully compromise the host server by simply importing a malicious Chatflow file, requiring no further user interaction. This isn’t theoretical; the impact is immediate server takeover.
Exploitation provides full control, enabling API key exfiltration and lateral movement within cloud environments or corporate networks. Cyber Updates - Asher Tamam highlights that the root cause lies in an insecure implementation of Anthropic’s MCP protocol, which permits arbitrary system command execution without sandboxing via the stdio channel. This is a fundamental security failure, not an edge case.
This incident underscores the inherent, massive supply chain risks in AI development. Running AI agents in inadequately hardened or isolated environments is a ticking time bomb. Attackers will always find the weakest link, and unsandboxed execution is a gift wrapped for them.
What This Means For You
- If your organization utilizes Flowise, this RCE is a critical, immediate threat. Update to the patched version *now*. Beyond patching, re-evaluate your architecture for running AI agents. Any AI component that can execute code without strong sandboxing is a severe risk. Assume compromise and build isolation layers.
Related ATT&CK Techniques
🛡️ Detection Rules
3 rules · 6 SIEM formats3 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
Flowise RCE via Malicious Chatflow Import
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40933 | RCE | Flowise system |
| CVE-2026-40933 | RCE | Import of malicious Chatflow file |
| CVE-2026-40933 | Code Injection | Insecure implementation of Anthropic's MCP protocol allowing system command execution via stdio channel without sandboxing |
Written by SCW Vulnerability Desk
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