Flowise MCP RCE: What CVE-2026-40933 Teaches About Agent Security
CVE-2026-40933 highlights a critical remote code execution vulnerability in Flowise and related components due to unsafe handling of Model Context Protocol (MCP) STDIO servers, which can act as process launchers when user-controlled inputs are involved. The issue underscores the limitations of input sanitization and emphasizes treating any user-configurable MCP STDIO server as a potential execution surface. Organizations are advised to patch affected systems, restrict configuration privileges, and implement runtime isolation to mitigate risks.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3841863) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } tokenmixai Posted on Apr 29 • Originally published at tokenmix.ai Flowise MCP RCE: What CVE-2026-40933 Teaches About Agent Security #ai #security #mcp #devops Flowise MCP RCE is not just another patch note. It is a warning about how agent builders handle Model Context Protocol servers, especially STDIO-based tools. The full TokenMix.ai version is here: Flowise MCP RCE: 10 Fixes for CVE-2026-40933 and Upsonic. Short version: Patch Flowise to 3.1.0 or later.
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