CVE-2026-3683
📋 TL;DR
This vulnerability in bufanyun HotGo allows attackers to perform server-side request forgery (SSRF) attacks by manipulating the ImageTransferStorage function. Attackers can exploit this to make the server send unauthorized requests to internal or external systems. All users running HotGo versions up to 2.0 are affected.
💻 Affected Systems
- bufanyun HotGo
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers could access internal services, exfiltrate sensitive data, or pivot to other systems within the network.
Likely Case
Unauthorized access to internal HTTP services, potential data leakage from internal APIs or metadata services.
If Mitigated
Limited to accessing only allowed external resources if proper network segmentation and egress filtering are in place.
🎯 Exploit Status
Exploit is publicly available; remote attack vector with no authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider upgrading if vendor releases a fix, or implement workarounds.
🔧 Temporary Workarounds
Input Validation and URL Whitelisting
allImplement strict validation of URLs in the ImageTransferStorage function to allow only trusted domains.
Network Segmentation
allRestrict outbound network access from the HotGo server to only necessary external services.
🧯 If You Can't Patch
- Disable the vulnerable upload functionality if not required.
- Implement a web application firewall (WAF) with SSRF protection rules.
🔍 How to Verify
Check if Vulnerable:
Check if running HotGo version 2.0 or earlier; review if the /server/internal/logic/common/upload.go file contains the vulnerable ImageTransferStorage function.Check Version:
Check application configuration or version files specific to HotGo deployment.Verify Fix Applied:
Test if the server can no longer make unauthorized requests to internal or external URLs via the upload endpoint.📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from the server, especially to internal IP ranges or metadata services.
Network Indicators:
- Unexpected HTTP traffic from the HotGo server to internal services or external domains not typically accessed.
SIEM Query:
source_ip:hotgo_server AND (dest_ip:169.254.169.254 OR dest_ip:10.0.0.0/8 OR dest_ip:172.16.0.0/12 OR dest_ip:192.168.0.0/16)