CVE-2026-3750: Continew Admin SSRF Vulnerability

CVE-2026-3750 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in ContiNew Admin up to version 4.2.0. This security flaw affects the URI.create function within the file continew-system/src/main/java/top/continew/admin/system/factory/S3ClientFactory.java, which is part of the Storage Management Module. The vulnerability allows attackers to manipulate server-side requests, potentially enabling access to internal resources or services that should not be externally accessible.

Critical Impact

Attackers with privileged access can exploit this SSRF vulnerability remotely to forge server-side requests, potentially accessing internal network resources, cloud metadata services, or sensitive internal APIs.

Affected Products

• ContiNew Admin versions up to and including 4.2.0
• S3ClientFactory component in the Storage Management Module
• Applications utilizing the vulnerable URI.create function in continew-system

Discovery Timeline

• 2026-03-08 - CVE-2026-3750 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-3750

Vulnerability Analysis

This SSRF vulnerability exists in the ContiNew Admin application's Storage Management Module. The flaw is specifically located in the S3ClientFactory.java file, where the URI.create function processes user-supplied input without adequate validation or sanitization. When an attacker with high privileges supplies a malicious URI, the server processes this request on behalf of the attacker, potentially reaching internal services, cloud metadata endpoints, or other protected resources that are not directly accessible from external networks.

The vulnerability requires network access and high-level privileges to exploit. While the direct impact on confidentiality, integrity, and availability is limited, SSRF vulnerabilities can serve as a pivot point for more sophisticated attacks against internal infrastructure.

Root Cause

The root cause of this vulnerability is improper input validation in the URI.create function within the S3ClientFactory.java file. The Storage Management Module fails to properly sanitize or validate URIs before making server-side requests, allowing attackers to specify arbitrary destinations. This is classified as CWE-918 (Server-Side Request Forgery).

Attack Vector

The attack vector is network-based, requiring the attacker to have high-level privileges within the ContiNew Admin application. The exploit has been publicly disclosed and documented. An attacker can manipulate the URI parameter in storage management requests to redirect server-side HTTP requests to arbitrary destinations, including internal network addresses, localhost services, or cloud metadata endpoints.

The vulnerability mechanism works by accepting user-controlled URI input and passing it directly to the URI.create function without proper validation. This allows attackers to craft requests that target internal resources such as http://169.254.169.254/ (cloud metadata services), http://localhost:port/ (local services), or internal network addresses. For detailed technical analysis, refer to the SSRF Vulnerability Analysis on Notion.

Detection Methods for CVE-2026-3750

Indicators of Compromise

• Unusual outbound requests from the ContiNew Admin server to internal IP ranges or metadata service endpoints
• Storage management API calls containing suspicious URI patterns targeting internal resources
• Log entries showing requests to cloud metadata endpoints (e.g., 169.254.169.254)
• Unexpected network connections from the application server to local services or internal infrastructure

Detection Strategies

• Monitor application logs for unusual URI patterns in storage management requests, particularly those targeting internal IP addresses or localhost
• Implement network-level detection for outbound connections to metadata service IP ranges from application servers
• Review web application firewall logs for requests containing internal network addresses in API parameters
• Deploy behavioral analysis to identify anomalous request patterns from privileged user accounts

Monitoring Recommendations

• Configure alerting for any outbound requests from the ContiNew Admin server targeting RFC 1918 private address ranges
• Enable verbose logging on the Storage Management Module to capture all URI parameters processed by S3ClientFactory.java
• Monitor cloud provider security logs for unauthorized metadata API access attempts
• Implement egress filtering and logging to detect SSRF exploitation attempts

How to Mitigate CVE-2026-3750

Immediate Actions Required

• Upgrade ContiNew Admin to a patched version when available from the vendor
• Implement input validation to restrict URIs to approved external endpoints only
• Apply network-level controls to prevent the application server from making requests to internal IP ranges
• Review and audit all privileged user accounts for suspicious activity

Patch Information

The vendor was contacted about this vulnerability but did not respond. No official patch information is currently available. Organizations should monitor the VulDB entry for updates on remediation guidance. Users are advised to implement workarounds until an official patch is released.

Workarounds

• Implement a URL allowlist for the Storage Management Module to restrict valid S3 endpoint destinations
• Deploy network segmentation to prevent the application server from accessing internal services or metadata endpoints
• Apply egress firewall rules blocking requests to internal IP ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16, 169.254.0.0/16)
• Consider temporarily disabling the Storage Management Module if it is not critical to operations

# Example iptables rules to block outbound requests to internal networks
iptables -A OUTPUT -d 169.254.169.254 -j DROP
iptables -A OUTPUT -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -d 192.168.0.0/16 -j DROP