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CVE-2026-56274 is a remote code execution vulnerability affecting Flowise before version 3.1.2 in the Custom MCP Server feature. The issue consists of multiple OS command injection flaws caused by incomplete command and flag validation in the command-filtering logic and a regex-based bypass in local file access argument validation. An authenticated attacker can configure a malicious MCP server definition that evades these protections and causes Flowise to execute attacker-controlled operating system commands on the underlying host. The vulnerable behavior is reachable by users with a Flowise account of any role, or through API access that has view and update permissions for chatflows.
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What an attacker gets, and what they’ve been doing with it.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability in Flowise MCP Server referenced by a Metasploit exploit module addition.
A critical remote code execution vulnerability in Flowise's Custom MCP Server feature caused by incomplete command-flag validation and a regex bypass in local file access restrictions, allowing arbitrary command execution on the Flowise host.
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.