CVE-2026-3026: Jeewms SSRF Vulnerability in UEditor

CVE-2026-3026 Overview

A Server-Side Request Forgery (SSRF) vulnerability has been identified in erzhongxmu JEEWMS version 3.7. This vulnerability exists within the UEditor component, specifically in the file /plug-in/ueditor/jsp/getRemoteImage.jsp. The vulnerability allows remote attackers to manipulate the upfile argument to initiate arbitrary server-side requests, potentially enabling access to internal resources, sensitive data exfiltration, or further network reconnaissance.

Critical Impact

Remote attackers can exploit this SSRF vulnerability without authentication to access internal network resources, potentially compromising sensitive systems and data behind the firewall.

Affected Products

• JEEWMS version 3.7
• erzhongxmu JEEWMS UEditor component
• Systems running /plug-in/ueditor/jsp/getRemoteImage.jsp endpoint

Discovery Timeline

• 2026-02-23 - CVE-2026-3026 published to NVD
• 2026-02-24 - Last updated in NVD database

Technical Details for CVE-2026-3026

Vulnerability Analysis

This SSRF vulnerability in JEEWMS 3.7 affects the UEditor rich text editor component, which is commonly used in Java-based web applications for content management. The vulnerable endpoint /plug-in/ueditor/jsp/getRemoteImage.jsp is designed to fetch remote images for embedding in content. However, insufficient validation of the upfile parameter allows attackers to specify arbitrary URLs, causing the server to make requests to unintended destinations.

The vulnerability enables attackers to leverage the server as a proxy to access internal resources that would otherwise be unreachable from external networks. This can lead to exposure of internal services, metadata endpoints in cloud environments, or sensitive configuration data. The exploit has been publicly disclosed and is available for use, increasing the risk of active exploitation. Notably, the vendor was contacted about this disclosure but did not respond.

Root Cause

The root cause of this vulnerability is improper input validation in the getRemoteImage.jsp file. The upfile parameter accepts URL values without adequate sanitization or restrictions on the target domain, protocol, or IP address ranges. This allows attackers to specify internal IP addresses, localhost references, or cloud metadata endpoints as valid request targets.

The UEditor component fails to implement proper URL validation controls such as allowlisting permitted domains, blocking private IP ranges, or restricting protocols to only HTTP/HTTPS for legitimate external resources.

Attack Vector

The attack can be initiated remotely over the network without authentication. An attacker sends a crafted HTTP request to the vulnerable endpoint with a malicious URL in the upfile parameter. The server processes this request and initiates an outbound connection to the attacker-specified destination, returning the response content or revealing information about the internal network topology through error messages.

Common attack scenarios include accessing cloud metadata services (e.g., AWS IMDSv1 at http://169.254.169.254/), scanning internal network ports, accessing internal APIs, or retrieving sensitive configuration files from internal systems.

Detection Methods for CVE-2026-3026

Indicators of Compromise

• HTTP requests to /plug-in/ueditor/jsp/getRemoteImage.jsp with unusual upfile parameter values
• Server-initiated connections to internal IP addresses (10.x.x.x, 172.16-31.x.x, 192.168.x.x)
• Requests targeting cloud metadata endpoints (169.254.169.254)
• Outbound connections from the web server to unexpected internal services

Detection Strategies

• Monitor web application logs for requests to the vulnerable UEditor endpoint with upfile parameters containing internal IP addresses or localhost references
• Implement network monitoring to detect anomalous outbound traffic from web servers to internal network segments
• Deploy web application firewall (WAF) rules to inspect and block requests with SSRF patterns in the upfile parameter
• Review application logs for error messages indicating failed connections to internal resources

Monitoring Recommendations

• Configure alerting for any requests to /plug-in/ueditor/jsp/getRemoteImage.jsp from external sources
• Monitor DNS queries from the web server for internal hostnames or suspicious resolution patterns
• Implement egress filtering and log all outbound connections from the application server
• Use SentinelOne Singularity Platform to detect and correlate suspicious server-side request patterns

How to Mitigate CVE-2026-3026

Immediate Actions Required

• Disable or remove the /plug-in/ueditor/jsp/getRemoteImage.jsp endpoint if not required for business operations
• Implement a web application firewall (WAF) rule to block requests containing internal IP addresses or restricted protocols in the upfile parameter
• Restrict outbound network access from the web server to only required external resources
• Apply network segmentation to limit the impact of potential SSRF exploitation

Patch Information

As of the last update, the vendor (erzhongxmu) has not responded to disclosure attempts and no official patch is available. Organizations should implement compensating controls until an official fix is released. Monitor the VulDB advisory for updates on vendor response and patch availability.

Workarounds

• Implement URL allowlisting in the UEditor configuration to permit only trusted external domains
• Deploy network-level controls to block outbound requests from the web application to internal IP ranges and cloud metadata endpoints
• Use a reverse proxy to sanitize and validate all incoming requests before they reach the UEditor component
• Consider replacing UEditor with a more secure rich text editor implementation that includes built-in SSRF protections

# Example: Block SSRF attempts using iptables egress filtering
# Prevent web server from accessing internal networks
iptables -A OUTPUT -m owner --uid-owner www-data -d 10.0.0.0/8 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 172.16.0.0/12 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 192.168.0.0/16 -j DROP
iptables -A OUTPUT -m owner --uid-owner www-data -d 169.254.169.254 -j DROP