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CVE-2026-40933 is a critical command injection vulnerability in Flowise affecting versions prior to 3.1.0. The flaw is in the Model Context Protocol (MCP) adapter’s handling and serialization of stdio-based MCP server commands. Flowise allows users to configure Custom MCP tools that launch local processes via stdio transport; insufficient sanitization and unsafe trust in user-controlled command and argument fields allow an authenticated attacker to supply a command line that results in arbitrary operating system command execution. Reported exploitation paths include directly creating or editing a Custom MCP stdio configuration and importing a crafted chatflow containing a malicious MCP configuration. In affected deployments, tool enumeration during rendering or import can trigger execution before any explicit save or run action. The issue persists despite validation logic and allowlisting because permitted commands can still be combined with arguments or environment-controlled behaviors that invoke arbitrary code. Successful exploitation yields code execution in the security context of the Flowise process.
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23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Command injection vulnerability in the Flowise MCP stdio adapter, presented as an RCE issue in AI-platform infrastructure.
A critical command injection / remote code execution vulnerability in Flowise's MCP adapter caused by unsafe serialization of stdio commands, enabling authenticated attackers to execute arbitrary OS commands.
A one-click remote code execution vulnerability in Flowise's Custom MCP tool handling that allows attacker-controlled stdio MCP configurations embedded in shared chatflows to execute arbitrary server-side code during import.
A vulnerability in Flowise stemming from unsafe MCP STDIO configuration that can enable command execution on the server.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.