CVE-2026-5848: JimuReport RCE Vulnerability

CVE-2026-5848 Overview

A code injection vulnerability has been identified in JeecgBoot JimuReport up to version 2.3.0. The vulnerability exists in the DriverManager.getConnection function within the /drag/onlDragDataSource/testConnection endpoint of the Data Source Handler component. An attacker can exploit this flaw by manipulating the dbUrl argument, enabling arbitrary code injection. The vulnerability can be exploited remotely and the exploit has been made public. The vendor has confirmed the issue and announced plans to provide a fix in an upcoming release.

Critical Impact

Remote attackers with high privileges can exploit this code injection vulnerability to manipulate database connections and potentially execute arbitrary code on affected JimuReport installations.

Affected Products

• JeecgBoot JimuReport versions up to 2.3.0
• Systems using the Data Source Handler component with /drag/onlDragDataSource/testConnection endpoint

Discovery Timeline

• April 9, 2026 - CVE-2026-5848 published to NVD
• April 9, 2026 - Last updated in NVD database

Technical Details for CVE-2026-5848

Vulnerability Analysis

This vulnerability is classified as CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The flaw resides in the Data Source Handler component of JimuReport, specifically within the test connection functionality used to validate database connections.

The vulnerable endpoint /drag/onlDragDataSource/testConnection accepts a dbUrl parameter that is passed directly to DriverManager.getConnection() without proper sanitization or validation. This allows an authenticated attacker with elevated privileges to craft malicious database URL strings that can be interpreted as executable code or commands by the underlying system.

The attack requires network access and high-level privileges within the JimuReport application. While this limits the attack surface, successful exploitation could result in unauthorized access to sensitive data, modification of database configurations, or potential lateral movement within the network.

Root Cause

The root cause of this vulnerability is insufficient input validation and sanitization of the dbUrl parameter before it is passed to the DriverManager.getConnection() method. The application fails to properly neutralize special elements in the user-supplied database URL, allowing injection of malicious content that is processed by downstream components.

Attack Vector

The attack is conducted remotely over the network. An attacker with high-level privileges in the JimuReport application can send a crafted HTTP request to the /drag/onlDragDataSource/testConnection endpoint with a malicious dbUrl parameter. The manipulated connection string is then processed by the DriverManager.getConnection() function, resulting in code injection.

The vulnerability is exploited through the test connection feature, which is intended to validate database connectivity before saving data source configurations. By injecting malicious payloads into the database URL, attackers can bypass intended functionality and execute arbitrary code or commands.

For detailed technical information about this vulnerability, refer to the GitHub Issue #4587 and the VulDB entry #356374.

Detection Methods for CVE-2026-5848

Indicators of Compromise

• Unusual or malformed requests to the /drag/onlDragDataSource/testConnection endpoint
• Database connection attempts with suspicious URL patterns containing injection payloads
• Unexpected database connection errors or exceptions in application logs
• Anomalous network traffic originating from the JimuReport application server

Detection Strategies

• Monitor HTTP request logs for requests to /drag/onlDragDataSource/testConnection with unusual dbUrl parameter values
• Implement Web Application Firewall (WAF) rules to detect and block injection patterns in database URL parameters
• Configure intrusion detection systems to alert on suspicious JDBC connection string patterns
• Review JimuReport application logs for failed or unusual database connection test attempts

Monitoring Recommendations

• Enable detailed logging for the Data Source Handler component
• Set up alerts for multiple failed connection test attempts from the same user or session
• Monitor for unauthorized configuration changes to data source settings
• Implement network segmentation to limit potential lateral movement if exploitation occurs

How to Mitigate CVE-2026-5848

Immediate Actions Required

• Restrict access to the /drag/onlDragDataSource/testConnection endpoint to only trusted administrators
• Implement network-level access controls to limit who can reach the JimuReport administration interface
• Review and audit user accounts with elevated privileges in the JimuReport application
• Monitor for exploitation attempts while awaiting an official patch

Patch Information

The vendor has confirmed this vulnerability and announced that a fix will be provided in an upcoming release. Organizations should monitor the JimuReport GitHub repository for patch announcements and update to the fixed version as soon as it becomes available. Track the issue progress via GitHub Issue #4587.

Workarounds

• Implement strict input validation for the dbUrl parameter at the application or web server level
• Use a reverse proxy or WAF to filter and sanitize requests to the vulnerable endpoint
• Disable the test connection functionality if it is not essential for operations
• Apply the principle of least privilege by limiting the number of users with access to data source configuration features

# Example: Restrict access to vulnerable endpoint via Apache configuration
<Location "/drag/onlDragDataSource/testConnection">
    Require ip 10.0.0.0/8
    Require ip 192.168.0.0/16
</Location>