CVE-2026-2852: Yeqifu Warehouse Auth Bypass Vulnerability

CVE-2026-2852 Overview

A vulnerability has been identified in yeqifu warehouse affecting the Sales Endpoint component. This improper access control vulnerability exists in the addSales, updateSales, and deleteSales functions within the SalesController.java file. The flaw allows attackers to bypass authorization checks and perform unauthorized operations on sales data through network-based attacks.

Critical Impact

Unauthorized users can manipulate sales records including adding, updating, and deleting sales data, potentially leading to data integrity issues and business logic bypass.

Affected Products

• yeqifu warehouse (up to commit aaf29962ba407d22d991781de28796ee7b4670e4)

Discovery Timeline

• 2026-02-20 - CVE CVE-2026-2852 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-2852

Vulnerability Analysis

This vulnerability is classified under CWE-266 (Incorrect Privilege Assignment), indicating that the application fails to properly validate user privileges before allowing access to sensitive sales management functions. The affected component is the Sales Endpoint, specifically the controller file located at dataset\repos\warehouse\src\main\java\com\yeqifu\bus\controller\SalesController.java.

The vulnerability allows remote attackers with low-level privileges to perform unauthorized operations on sales data. The attack does not require user interaction, making it straightforward to exploit. The impact affects confidentiality, integrity, and availability of sales data, though the scope is limited to the vulnerable component itself.

Root Cause

The root cause lies in the improper implementation of access controls within the SalesController.java file. The addSales, updateSales, and deleteSales functions fail to properly verify that the requesting user has appropriate authorization to perform these operations. This allows users with insufficient privileges to manipulate sales records they should not have access to.

Attack Vector

The attack can be carried out remotely over the network. An authenticated user with minimal privileges can exploit this vulnerability by directly calling the affected endpoint functions. The exploit is publicly available as documented in GitHub Issue #63 Discussion.

The vulnerability manifests in the sales controller functions where authorization checks are either missing or improperly implemented. An attacker can craft HTTP requests to the sales endpoints (addSales, updateSales, deleteSales) to manipulate sales data without proper authorization verification. For technical details, refer to the GitHub Issue Comment #3846671301.

Detection Methods for CVE-2026-2852

Indicators of Compromise

• Unusual volume of requests to /sales endpoints from low-privileged user accounts
• Sales records being created, modified, or deleted by users without appropriate business roles
• Audit log entries showing sales operations from unexpected user accounts or IP addresses
• Discrepancies between expected and actual sales data integrity

Detection Strategies

• Monitor HTTP requests to the addSales, updateSales, and deleteSales endpoints for unauthorized access patterns
• Implement application-level logging to track which users are performing sales operations
• Correlate authentication logs with sales endpoint access to identify privilege escalation attempts
• Deploy web application firewall rules to detect anomalous request patterns to sales endpoints

Monitoring Recommendations

• Enable detailed access logging for all sales-related API endpoints
• Set up alerts for sales operations performed by users outside of defined business hours
• Implement real-time monitoring for bulk sales data modifications
• Review audit trails regularly for unauthorized access attempts to sales functionality

How to Mitigate CVE-2026-2852

Immediate Actions Required

• Review and restrict access to the SalesController.java endpoint functions based on user roles
• Implement proper role-based access control (RBAC) checks before executing sales operations
• Audit existing sales data for potential unauthorized modifications
• Consider temporarily disabling the affected endpoints until proper access controls are implemented

Patch Information

The yeqifu warehouse project adopts a rolling release strategy for continuous delivery, so specific version details for patched releases are not available. The project was notified about this vulnerability through GitHub Issue #63 but has not responded at the time of publication. Users should monitor the GitHub Repository for Warehouse for updates.

Workarounds

• Implement a reverse proxy or API gateway with additional authorization rules to protect the sales endpoints
• Add custom authorization filters at the application level to validate user privileges before processing requests
• Restrict network access to the application to trusted IP ranges or VPN users only

# Example: Restrict access to sales endpoints using nginx
location ~ ^/api/sales/(add|update|delete) {
    # Require additional authentication or restrict to specific roles
    auth_request /auth/verify-sales-permission;
    proxy_pass http://backend;
}