CVE-2026-2849: Yeqifu Warehouse Auth Bypass Vulnerability

CVE-2026-2849 Overview

A vulnerability has been identified in the Yeqifu Warehouse application affecting the Cache Sync Handler component. The flaw exists in the deleteCache, removeAllCache, and syncCache functions within the CacheController.java file. This improper access control vulnerability allows remote authenticated attackers to manipulate cache operations without proper authorization checks, potentially leading to data integrity issues and unauthorized modifications to the application's caching mechanism.

Critical Impact

Authenticated attackers can remotely exploit improper access controls in the cache management functions to perform unauthorized cache operations, potentially disrupting application functionality and data integrity.

Affected Products

• Yeqifu Warehouse (all versions up to commit aaf29962ba407d22d991781de28796ee7b4670e4)

Discovery Timeline

• 2026-02-20 - CVE-2026-2849 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-2849

Vulnerability Analysis

This vulnerability is classified under CWE-266 (Incorrect Privilege Assignment), indicating that the affected functions lack proper authorization checks before executing sensitive cache operations. The vulnerability resides in the CacheController.java file located at dataset\repos\warehouse\src\main\java\com\yeqifu\sys\controller\CacheController.java.

The affected functions (deleteCache, removeAllCache, and syncCache) can be invoked by authenticated users who should not have privileges to perform such operations. This represents a broken access control scenario where the application fails to enforce proper privilege boundaries for cache management functionality.

The attack can be launched remotely over the network with low complexity requirements. An attacker with low-level privileges can exploit this vulnerability without any user interaction, potentially compromising data integrity and availability of the caching subsystem.

Root Cause

The root cause of this vulnerability is the absence of proper access control mechanisms within the cache controller endpoints. The application does not adequately verify whether the authenticated user possesses the appropriate privileges to execute cache management operations. This allows users with basic authentication to access administrative-level cache functions that should be restricted to privileged roles only.

The Yeqifu Warehouse project operates on a rolling release model without versioned releases, making it difficult to track exactly when the vulnerability was introduced. The issue has been publicly disclosed through the project's GitHub issue tracker, but as of the last update, the maintainers have not responded to the security report.

Attack Vector

The vulnerability is exploitable remotely via network access. An attacker who has obtained valid authentication credentials (even with minimal privileges) can send HTTP requests to the cache controller endpoints to perform unauthorized cache operations.

The exploitation scenario involves:

1. An attacker authenticates to the Yeqifu Warehouse application with any valid user account
2. The attacker sends requests to the cache management endpoints (deleteCache, removeAllCache, or syncCache)
3. Due to missing access control checks, the application processes these requests regardless of the user's actual privilege level
4. The attacker can delete cache entries, clear all caches, or trigger cache synchronization operations

For technical details on the vulnerability, refer to the GitHub Issue #60 and the VulDB entry.

Detection Methods for CVE-2026-2849

Indicators of Compromise

• Unexpected cache operations appearing in application logs from non-administrative users
• Unusual patterns of requests to /cache/deleteCache, /cache/removeAllCache, or /cache/syncCache endpoints
• Application performance anomalies or data inconsistencies potentially caused by unauthorized cache manipulation

Detection Strategies

• Implement logging and alerting for all cache management endpoint access attempts
• Monitor authentication logs for users accessing cache controller endpoints who lack administrative roles
• Deploy web application firewall (WAF) rules to detect and alert on repeated cache operation requests from single sessions
• Review access logs for patterns of cache endpoint access from users who should not have cache management privileges

Monitoring Recommendations

• Enable detailed audit logging for all cache controller endpoints in the Yeqifu Warehouse application
• Configure security information and event management (SIEM) rules to correlate user role assignments with cache operation requests
• Establish baseline metrics for normal cache operation patterns to identify anomalous activity

How to Mitigate CVE-2026-2849

Immediate Actions Required

• Restrict network access to the Yeqifu Warehouse application to trusted users only until a patch is available
• Implement additional authentication layers or IP-based access controls for cache management endpoints
• Review and audit user accounts to ensure principle of least privilege is enforced
• Monitor application logs for any signs of exploitation attempts

Patch Information

As of the last update on 2026-02-26, no official patch has been released by the Yeqifu project maintainers. The project operates on a rolling release model without versioned releases, and the maintainers have not responded to the security report filed via GitHub Issue #60.

Organizations using this software should:

1. Monitor the Yeqifu Warehouse GitHub repository for security updates
2. Consider implementing custom access control patches locally if possible
3. Evaluate alternative warehouse management solutions if the vulnerability remains unaddressed

Workarounds

• Implement a reverse proxy or API gateway with access control rules to restrict access to cache management endpoints based on user roles
• Modify the application configuration to disable or remove the cache controller endpoints if they are not essential for operations
• Apply network segmentation to limit which systems and users can reach the Yeqifu Warehouse application
• Deploy a web application firewall (WAF) with custom rules to block unauthorized requests to cache endpoints

# Example nginx configuration to restrict cache endpoint access
location ~ ^/cache/(deleteCache|removeAllCache|syncCache) {
    # Restrict to internal admin network only
    allow 10.0.0.0/8;
    deny all;
    
    # Or require additional authentication
    auth_basic "Admin Only";
    auth_basic_user_file /etc/nginx/.htpasswd_admin;
    
    proxy_pass http://warehouse_backend;
}