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CVE-2026-40933 is a command-injection vulnerability in Flowise Custom MCP tooling using the MCP stdio transport. Unsafe serialization and execution of user-controlled MCP command and argument configuration allows a configured stdio server to spawn an arbitrary process on the Flowise host. Validation based on command allowlists and blocked flags is insufficient because permitted launchers can accept alternate execution-capable arguments or environment-controlled behavior. A crafted chatflow containing a malicious Custom MCP configuration can also trigger execution during import when Flowise enumerates MCP actions for the rendered flow. The issue affects self-hosted Flowise deployments where stdio MCP is available; Flowise Cloud is not affected because stdio MCP is disabled.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
26 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical Flowise vulnerability in the MCP adapter that permits an authenticated attacker to execute arbitrary commands. It was fixed in Flowise version 3.1.0.
MCP STDIO command-injection vulnerability affecting Flowise, within the described pattern where MCP configuration strings reach process-spawn operations without sanitization.
A prior remote-code-execution vulnerability associated with Flowise's Custom MCP node.
Command injection vulnerability in the Flowise MCP stdio adapter, presented as an RCE issue in AI-platform infrastructure.
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.