CVE-2026-2076: Yeqifu Warehouse Auth Bypass Vulnerability

CVE-2026-2076 Overview

A significant improper authorization vulnerability has been identified in the Yeqifu Warehouse application, affecting the User Management Endpoint. The vulnerability exists within the addUser, updateUser, and deleteUser functions located in UserController.java. This weakness allows remote attackers to manipulate user management operations without proper authorization checks, potentially leading to unauthorized access and privilege abuse within the warehouse management system.

Critical Impact

Remote attackers can exploit improper authorization in user management functions to add, update, or delete users without proper authorization, compromising the integrity of the warehouse system's access control.

Affected Products

• Yeqifu Warehouse (all versions up to commit aaf29962ba407d22d991781de28796ee7b4670e4)
• Yeqifu Warehouse User Management Endpoint component
• Java-based warehouse management deployments using affected source code

Discovery Timeline

• 2026-02-07 - CVE-2026-2076 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-2076

Vulnerability Analysis

This vulnerability is classified as CWE-266 (Incorrect Privilege Assignment), which occurs when the application fails to properly enforce authorization controls on sensitive user management operations. The affected component is the User Management Endpoint within the Yeqifu Warehouse application, specifically the UserController.java file located at dataset\repos\warehouse\src\main\java\com\yeqifu\sys\controller\UserController.java.

The vulnerability allows authenticated users with insufficient privileges to perform administrative user management operations, including creating new users, modifying existing user accounts, and deleting user records. This represents a broken access control scenario where the application does not adequately verify that the requesting user has the appropriate permissions to execute these sensitive operations.

Root Cause

The root cause lies in the improper implementation of authorization checks within the addUser, updateUser, and deleteUser functions. The controller methods likely either:

1. Lack role-based access control (RBAC) validation before executing user management operations
2. Contain flawed authorization logic that can be bypassed
3. Rely solely on authentication without verifying the authenticated user's privileges to perform administrative actions

This is a common architectural flaw in web applications where developers implement authentication but neglect to properly implement and enforce authorization controls on sensitive endpoints.

Attack Vector

The attack can be initiated remotely over the network. An attacker with basic authentication credentials (low-privilege user) can send crafted HTTP requests directly to the User Management Endpoint. By invoking the vulnerable functions (addUser, updateUser, deleteUser) without possessing administrative privileges, the attacker can:

• Create new user accounts, potentially with elevated privileges
• Modify existing user accounts, including changing passwords or escalating privileges
• Delete legitimate user accounts, causing denial of service or disrupting operations

The attack requires no user interaction and can be executed with low complexity once the attacker has network access to the application and basic authentication credentials. The exploit has been publicly disclosed, increasing the risk of active exploitation.

Detection Methods for CVE-2026-2076

Indicators of Compromise

• Unexpected user account creations, modifications, or deletions in the warehouse system
• Authentication logs showing user management API calls from non-administrative accounts
• HTTP requests to /sys/controller/UserController endpoints from unauthorized sources
• Audit trail anomalies in user management operations without corresponding administrative sessions

Detection Strategies

• Monitor HTTP traffic for requests to the User Management Endpoint (/addUser, /updateUser, /deleteUser paths) and correlate with the requester's privilege level
• Implement application-level logging that captures both the action performed and the authenticated user's role for user management operations
• Configure web application firewall (WAF) rules to alert on rapid or suspicious patterns of user management API calls
• Deploy endpoint detection and response (EDR) solutions to monitor for suspicious Java process behaviors associated with the warehouse application

Monitoring Recommendations

• Enable verbose logging on the Yeqifu Warehouse application to capture all user management operations with full request context
• Set up SIEM rules to correlate authentication events with subsequent user management actions to identify privilege violations
• Perform regular user account audits to detect unauthorized accounts or privilege changes
• Monitor for access patterns that deviate from normal administrative workflows

How to Mitigate CVE-2026-2076

Immediate Actions Required

• Review and restrict access to the User Management Endpoint to only verified administrative users
• Implement network-level controls to limit access to the warehouse application from trusted sources only
• Audit existing user accounts for any unauthorized modifications or suspicious account creations
• Consider temporarily disabling user management functionality until a proper fix is applied

Patch Information

The Yeqifu Warehouse project uses continuous delivery with rolling releases, meaning no specific version numbers are assigned. The vulnerability was reported through GitHub Issue #53, but the project has not yet responded to the disclosure. Organizations should monitor the Yeqifu Warehouse GitHub repository for updates and apply patches as they become available.

Since no official patch has been released, organizations must implement workarounds to mitigate the risk.

Workarounds

• Implement custom authorization middleware or filters in the Spring framework to enforce role-based access control on user management endpoints
• Deploy an API gateway or reverse proxy with strict authorization rules to filter unauthorized requests before they reach the application
• Modify the affected UserController.java source code locally to add proper @PreAuthorize or similar security annotations requiring administrative roles
• Apply the principle of least privilege by ensuring all user accounts have minimal necessary permissions

# Example: Adding Spring Security annotation to require ADMIN role
# In UserController.java, add before each vulnerable method:
# @PreAuthorize("hasRole('ADMIN')")
# public ResponseEntity addUser(@RequestBody User user) { ... }

# Alternatively, configure method-level security in SecurityConfig.java
# @EnableGlobalMethodSecurity(prePostEnabled = true)