CVE-2026-2850: Yeqifu Warehouse Auth Bypass Vulnerability

CVE-2026-2850 Overview

A vulnerability was discovered in yeqifu warehouse affecting the Customer Endpoint component. This improper access control flaw exists in the addCustomer, updateCustomer, and deleteCustomer functions within the CustomerController.java file. The vulnerability allows remote attackers to manipulate customer data without proper authorization checks, potentially leading to unauthorized data modification or deletion.

Critical Impact

Remote attackers can exploit improper access controls to perform unauthorized customer data operations including adding, updating, and deleting customer records without proper authentication or authorization.

Affected Products

• yeqifu warehouse (all versions up to commit aaf29962ba407d22d991781de28796ee7b4670e4)
• Yeqifu Warehouse Customer Endpoint component
• CustomerController.java module

Discovery Timeline

• February 20, 2026 - CVE-2026-2850 published to NVD
• February 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-2850

Vulnerability Analysis

This vulnerability is classified as CWE-266 (Incorrect Privilege Assignment), which indicates that the application fails to properly enforce access controls when processing requests to the Customer Endpoint. The affected functions (addCustomer, updateCustomer, deleteCustomer) in CustomerController.java do not adequately verify whether the requesting user has the necessary privileges to perform these operations.

The vulnerability is remotely exploitable over the network with low attack complexity. An attacker with low privileges can leverage this flaw to gain unauthorized access to customer management functionality. The impact includes potential compromise of data confidentiality, integrity, and availability of customer records within the warehouse management system.

The project maintainers were informed of this vulnerability through GitHub Issue #61 but have not yet responded. This product follows a rolling release model, meaning no specific version numbers are assigned to releases.

Root Cause

The root cause of this vulnerability lies in the insufficient implementation of access control mechanisms within the Customer Endpoint. The CustomerController.java file lacks proper authorization checks before executing sensitive operations on customer data. This allows authenticated users with minimal privileges to perform actions that should be restricted to administrators or users with elevated permissions.

Attack Vector

The attack vector is network-based, allowing remote exploitation without requiring user interaction. An attacker with low-level authentication can send crafted HTTP requests to the Customer Endpoint to:

1. Add unauthorized customer records to the database
2. Modify existing customer information without proper authorization
3. Delete customer records, potentially causing data loss

The vulnerability exists in the controller layer where requests are processed before reaching the business logic, indicating missing or bypassed security filters.

Due to the nature of this access control vulnerability, exploitation involves sending standard HTTP requests to the affected endpoints. The specific attack methodology involves crafting requests to the /customer endpoint methods without proper privilege verification. Technical details can be found in the GitHub Issue #61 Comment and VulDB #347086.

Detection Methods for CVE-2026-2850

Indicators of Compromise

• Unusual HTTP requests to Customer Endpoint paths (/customer/add, /customer/update, /customer/delete)
• Unauthorized customer record modifications in database audit logs
• Access attempts from low-privileged accounts to customer management functions
• Anomalous patterns in customer data creation, modification, or deletion rates

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and flag suspicious requests to Customer Endpoint paths
• Enable detailed logging for all CustomerController operations including user context and privilege levels
• Deploy runtime application self-protection (RASP) to detect authorization bypass attempts
• Correlate authentication events with customer management operations to identify privilege misuse

Monitoring Recommendations

• Configure alerts for customer record modifications by non-administrative users
• Monitor database transaction logs for bulk or unusual customer data operations
• Implement real-time API activity monitoring for the warehouse application
• Review access control audit trails regularly for signs of unauthorized privilege usage

How to Mitigate CVE-2026-2850

Immediate Actions Required

• Restrict network access to the warehouse application to trusted IP ranges only
• Implement additional authentication layers for customer management endpoints
• Review and audit all user accounts with access to the warehouse system
• Enable comprehensive logging for forensic analysis if exploitation has occurred

Patch Information

As of the last update, no official patch has been released by the yeqifu project maintainers. The project was informed of the vulnerability through GitHub Issue #61 but has not yet responded. Due to the rolling release nature of this project, users should monitor the GitHub Repository for Warehouse for any future commits addressing this security issue.

Organizations using this software should consider implementing compensating controls until an official fix is available or evaluate alternative solutions if the project remains unresponsive.

Workarounds

• Implement a reverse proxy with access control rules to restrict access to the Customer Endpoint
• Add custom security filters in front of the CustomerController to enforce authorization checks
• Restrict database user permissions to minimize impact of potential exploitation
• Consider implementing role-based access control (RBAC) at the application server level

# Example: Restrict access to Customer Endpoint using nginx
location /customer {
    # Allow only from internal network
    allow 10.0.0.0/8;
    allow 192.168.0.0/16;
    deny all;
    
    # Additional authentication requirement
    auth_basic "Restricted Access";
    auth_basic_user_file /etc/nginx/.htpasswd;
    
    proxy_pass http://warehouse_backend;
}