CVE-2026-2097
📋 TL;DR
Agentflow software by Flowring contains an arbitrary file upload vulnerability that allows authenticated attackers to upload malicious files and execute arbitrary code on the server. This affects all systems running vulnerable versions of Agentflow, potentially compromising the entire server environment.
💻 Affected Systems
- Agentflow by Flowring
📦 What is this software?
Agentflow by Flowring
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover with persistent backdoor installation, data exfiltration, lateral movement to other systems, and ransomware deployment.
Likely Case
Web shell installation leading to data theft, credential harvesting, and use as pivot point for further attacks.
If Mitigated
Limited impact with proper file upload validation and execution restrictions in place.
🎯 Exploit Status
Exploitation requires authenticated access but is straightforward once credentials are obtained
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references; check vendor advisory
Vendor Advisory: https://www.twcert.org.tw/en/cp-139-10700-3534d-2.html
Restart Required: Yes
Instructions:
1. Check vendor advisory for specific patch version
2. Download and apply the patch from Flowring
3. Restart Agentflow services
4. Verify file upload functionality is properly restricted
🔧 Temporary Workarounds
Restrict File Upload Types
allConfigure web server to only allow specific file extensions and validate file content
# Configure web server (e.g., Apache/Nginx) to block upload of executable files
# Example Nginx: location ~ \.(php|asp|aspx|jsp)$ { deny all; }
Implement File Upload Directory Restrictions
linuxConfigure upload directory to prevent execution of uploaded files
# Linux: chmod -R 644 /path/to/uploads/
# Set directory to noexec: mount -o remount,noexec /path/to/uploads
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Agentflow servers
- Deploy web application firewall with file upload filtering rules
🔍 How to Verify
Check if Vulnerable:
Test if authenticated users can upload files with executable extensions (.php, .asp, .jsp) and access them via webCheck Version:
Check Agentflow version in admin interface or configuration filesVerify Fix Applied:
Attempt to upload malicious file types and verify they are rejected or cannot be executed📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with executable extensions
- Multiple failed upload attempts followed by successful upload
- Access to uploaded files with suspicious names
Network Indicators:
- HTTP POST requests to upload endpoints with executable file content
- Subsequent requests to uploaded files with parameters
SIEM Query:
source="web_logs" AND (uri="*upload*" OR uri="*.php" OR uri="*.asp" OR uri="*.jsp") AND status=200