CVE-2026-41264: FlowiseAI CSV Agent Critical RCE - Detection and Mitigation Guide

---
title: Potential FlowiseAI CSV Agent Exploitation via CSV Upload
id: 1a2b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects suspicious CSV file operations that may indicate exploitation of CVE-2026-41264 in FlowiseAI applications
references:
  - https://rapid7.com/blog/post/pt-weekly-metasploit-update-exploits-for-flowiseai-csv-agent-and-macos-package-kit
author: Security Arsenal
date: 2026/04/14
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: web_access
detection:
  selection:
    cs-method: 'POST'
    cs-uri-query|contains: '/api/v1/csv'  
    cs-content-type|contains: 'multipart/form-data'
  condition: selection
falsepositives:
  - Legitimate CSV uploads to FlowiseAI applications
level: medium
---
title: FlowiseAI Process Spawning Suspicious Child Processes
id: 2b3c4d5e-6f7a-8b9c-0d1e-2f3a4b5c6d7e
status: experimental
description: Detects Node.js/FlowiseAI spawning suspicious command shells or scripts that could indicate RCE
references:
  - https://rapid7.com/blog/post/pt-weekly-metasploit-update-exploits-for-flowiseai-csv-agent-and-macos-package-kit
author: Security Arsenal
date: 2026/04/14
tags:
  - attack.execution
  - attack.t1059.003
logsource:
  category: process_creation
  product: windows
detection:
  selection_parent:
    ParentImage|contains: 'node.exe'
  selection_child:
    Image|endswith:
      - '\cmd.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
  condition: all of selection_*
falsepositives:
  - Legitimate administrative activity
  - Authorized Node.js application operations
level: high
---
title: Suspicious FlowiseAI Network Connections Indicative of C2
id: 3c4d5e6f-7a8b-9c0d-1e2f-3a4b5c6d7e8f
status: experimental
description: Detects outbound network connections from FlowiseAI processes to non-standard ports, potential C2 activity
references:
  - https://rapid7.com/blog/post/pt-weekly-metasploit-update-exploits-for-flowiseai-csv-agent-and-macos-package-kit
author: Security Arsenal
date: 2026/04/14
tags:
  - attack.command_and_control
  - attack.t1071
logsource:
  category: network_connection
  product: windows
detection:
  selection:
    Image|contains: 'node'
    DestinationPort|notin:
      - 80
      - 443
      - 8080
      - 3000
  condition: selection
falsepositives:
  - Legitimate API calls to external services
  - Normal application update checks
level: medium

// Detect potential FlowiseAI CSV Agent exploitation via suspicious file uploads
let suspiciousEndpoints = DeviceNetworkEvents
| where InitiatingProcessFileName =~ "node.exe"
| where RemotePort in (443, 80, 8080) 
| summarize count() by InitiatingProcessId, DeviceName;
DeviceFileEvents
| where InitiatingProcessId in (suspiciousEndpoints)
| where FileName endswith ".csv"
| project Timestamp, DeviceName, FileName, FolderPath, InitiatingProcessFileName, SHA256, InitiatingProcessId
| order by Timestamp desc
| take 100;

-- Hunt for suspicious CSV uploads related to FlowiseAI
SELECT 
    FullPath, 
    Size, 
    Mtime, 
    Mode.String AS FileMode,
    Sys.uid as UID,
    Sys.gid as GID
FROM glob(globs='**/flowise/**/uploads/*.csv')
WHERE Mtime > now() - 7DAYS

-- Identify Node.js processes spawning suspicious child processes
SELECT 
    Pid, 
    Ppid, 
    Name, 
    Exe, 
    CommandLine, 
    Username, 
    StartTime 
FROM pslist()
WHERE Exe =~ "node" AND Name =~ "node"
JOIN (
    SELECT 
        Ppid, 
        Name, 
        Exe, 
        CommandLine 
    FROM pslist()
    WHERE Name =~ "sh" OR Name =~ "bash" OR Name =~ "powershell" OR Name =~ "cmd"
) ON Pid = Ppid

#!/bin/bash

# FlowiseAI CVE-2026-41264 Detection and Mitigation Script
# This script checks for vulnerable FlowiseAI installations and applies temporary mitigations

# Check if FlowiseAI is installed
echo "Checking for FlowiseAI installations..."

if [ -d "/opt/flowise" ]; then
    echo "FlowiseAI detected at /opt/flowise"
    FLOWISE_DIR="/opt/flowise"
elif [ -d "$HOME/flowise" ]; then
    echo "FlowiseAI detected at $HOME/flowise"
    FLOWISE_DIR="$HOME/flowise"
elif command -v flowise &> /dev/null; then
    FLOWISE_PATH=$(which flowise)
    echo "FlowiseAI found at $FLOWISE_PATH"
    FLOWISE_DIR=$(dirname $FLOWISE_PATH)
else
    echo "No FlowiseAI installation detected in standard locations."
    exit 0
fi

# Check for currently running FlowiseAI instances
echo "Checking for running FlowiseAI processes..."
if pgrep -f "flowise" > /dev/null; then
    echo "WARNING: FlowiseAI is currently running. Consider stopping the service."
    pgrep -f "flowise"
else
    echo "No FlowiseAI processes detected running."
fi

# Check for CSV Agent component usage
echo "Checking for CSV Agent component usage..."
if [ -d "$FLOWISE_DIR/node_modules" ]; then
    find "$FLOWISE_DIR/node_modules" -name "*csv*agent*" -o -name "*csv_agent*" 2>/dev/null | head -5
fi

# Apply temporary mitigation: Disable CSV Agent uploads
echo "Applying temporary mitigation..."
if [ -f "$FLOWISE_DIR/packages/components/nodes/agent/CSVAgent/CSVAgent.ts" ] || \
   [ -f "$FLOWISE_DIR/dist/components/nodes/agent/CSVAgent/CSVAgent.js" ]; then
    echo "CSV Agent component found. Consider disabling this functionality until patched."
    echo "Review FlowiseAI documentation for instructions to disable specific nodes."
else
    echo "CSV Agent component not found in standard locations."
fi

echo ""
echo "Recommendation: Update FlowiseAI to the latest patched version immediately."
echo "For official guidance, visit: https://github.com/FlowiseAI/Flowise/security/advisories"
echo ""