CVE-2026-5616: JeecgBoot Authentication Bypass Vulnerability

CVE-2026-5616 Overview

A missing authentication vulnerability has been identified in JeecgBoot versions 3.9.0 and 3.9.1. The vulnerability exists in the AI Chat Module, specifically within the JeecgBizToolsProvider.java file located at jeecg-boot/jeecg-module-system/jeecg-system-biz/src/main/java/org/jeecg/modules/airag/. This authentication bypass allows remote attackers to access functionality without proper authorization, potentially leading to unauthorized data access or system manipulation.

Critical Impact

Remote attackers can exploit this missing authentication vulnerability to access AI Chat Module functionality without credentials, potentially exposing sensitive data or enabling further attacks on the JeecgBoot application.

Affected Products

• JeecgBoot 3.9.0
• JeecgBoot 3.9.1

Discovery Timeline

• 2026-04-06 - CVE-2026-5616 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-5616

Vulnerability Analysis

This vulnerability is classified as CWE-287 (Improper Authentication), indicating that the affected component fails to properly authenticate users before granting access to protected functionality. The AI Chat Module in JeecgBoot contains endpoints or functions that should require authentication but do not properly enforce credential verification.

The vulnerability can be exploited remotely over the network, requiring no user interaction or prior authentication. An attacker can send crafted requests to the vulnerable endpoints and gain access to functionality that should be protected. This could allow unauthorized users to interact with the AI chat features, potentially accessing sensitive information or manipulating system behavior.

Root Cause

The root cause is missing authentication checks in the JeecgBizToolsProvider.java file within the AI Chat Module. The component fails to verify that incoming requests originate from authenticated users before processing them, creating an authentication bypass condition that allows unauthorized access.

Attack Vector

The attack can be executed remotely over the network without requiring any special privileges or user interaction. An attacker would target the AI Chat Module endpoints exposed by the JeecgBoot application, sending requests directly to the vulnerable component to bypass authentication requirements.

The vulnerable component is located in the JeecgBizToolsProvider.java file, which handles AI-related business tools functionality. Without proper authentication enforcement, any network-accessible attacker can interact with these endpoints as if they were an authenticated user.

Detection Methods for CVE-2026-5616

Indicators of Compromise

• Unusual or unauthorized access attempts to AI Chat Module endpoints without valid session tokens
• Requests to /jeecg-boot/ paths related to AI or chat functionality from unexpected IP addresses
• Increased traffic to JeecgBizToolsProvider related endpoints without corresponding authentication events
• Log entries showing successful API calls to AI module without prior login events

Detection Strategies

• Monitor web server and application logs for requests to AI Chat Module endpoints that lack authentication headers or tokens
• Implement anomaly detection for access patterns to the jeecg-module-system components
• Review access logs for requests originating from external networks targeting internal AI functionality
• Deploy network intrusion detection signatures for unauthorized access patterns to JeecgBoot endpoints

Monitoring Recommendations

• Enable verbose logging for the AI Chat Module to capture all access attempts with authentication status
• Configure alerting for failed or missing authentication events on sensitive endpoints
• Implement real-time monitoring for access to JeecgBizToolsProvider endpoints from untrusted sources
• Regularly audit access logs to identify patterns consistent with authentication bypass attempts

How to Mitigate CVE-2026-5616

Immediate Actions Required

• Upgrade JeecgBoot to a version containing the security patch (commits b7c9aeba7aefda9e008ea8fe4fc3daf08d0c5b39 or 2c1cc88c8d983868df8c520a343d6ff4369d9e59)
• If immediate patching is not possible, restrict network access to the AI Chat Module endpoints using firewall rules
• Review and audit access to the JeecgBoot application to identify any signs of exploitation
• Implement additional authentication layers at the network or reverse proxy level for the affected endpoints

Patch Information

The JeecgBoot project has addressed this vulnerability through commits b7c9aeba7aefda9e008ea8fe4fc3daf08d0c5b39 and 2c1cc88c8d983868df8c520a343d6ff4369d9e59. This fix is expected to be included in the next official release. Organizations are strongly advised to apply these patches as soon as possible. Additional details can be found in GitHub Issue #9464 and Pull Request #9463.

Workarounds

• Implement network-level access controls to restrict access to the AI Chat Module from untrusted networks
• Deploy a web application firewall (WAF) with rules to enforce authentication on vulnerable endpoints
• Temporarily disable the AI Chat Module if it is not critical to business operations until the patch is applied
• Configure reverse proxy authentication requirements for all requests targeting the jeecg-module-system paths

# Example: Restrict access to AI Chat Module via nginx
location /jeecg-boot/jeecg-module-system/ {
    # Require authentication at the proxy level
    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/.htpasswd;
    
    # Or restrict to trusted IP ranges only
    # allow 10.0.0.0/8;
    # deny all;
    
    proxy_pass http://backend;
}