CVE-2026-92402: ChangeWeDer CRM Auth Bypass Vulnerability

CVE-2026-92402 Overview

CVE-2026-92402 is a missing authorization vulnerability in the ChangeWeDer CRM application, affecting code up to commit c07bd4c97141521af6475034bc58523beed51bbd. The flaw resides in the index function of UserController.java within the top.upstudy.crm.controller.UserController component. An authenticated remote attacker with low privileges can invoke the endpoint without the expected authorization checks, resulting in limited exposure of confidentiality, integrity, and availability. The project does not use versioning, so precise affected and unaffected releases are not published. The maintainers were notified through a public issue report but have not responded at the time of disclosure.

Critical Impact

Remote, low-privileged attackers can reach a controller endpoint that fails to enforce authorization, exposing user-management functionality in ChangeWeDer CRM.

Affected Products

• ChangeWeDer CRM up to commit c07bd4c97141521af6475034bc58523beed51bbd
• Component: top.upstudy.crm.controller.UserController
• File: UserController.java, function index

Discovery Timeline

• 2026-09-16 - CVE-2026-92402 published to NVD
• 2026-09-16 - Last updated in NVD database

Technical Details for CVE-2026-92402

Vulnerability Analysis

The vulnerability is a missing authorization issue [CWE-862] in the index function of UserController.java. The controller processes incoming HTTP requests without verifying that the caller holds the privileges required to access the underlying user-management logic. Because ChangeWeDer CRM does not publish versioned releases, defenders must reason about the codebase at the commit level rather than through release tags. Public reporting indicates the flaw is reachable over the network with low attack complexity and requires only low privileges, with no user interaction. The impact scope is limited to the vulnerable component and does not cascade to other systems.

Root Cause

The root cause is the absence of an authorization check on the index handler in the top.upstudy.crm.controller.UserController class. Java controllers commonly rely on framework annotations or interceptor rules to gate access to sensitive endpoints. When these controls are omitted, the endpoint is served to any authenticated principal regardless of role. This is a canonical instance of broken access control at the controller layer.

Attack Vector

Exploitation is performed remotely over the network. The attacker authenticates with a low-privileged account and issues a direct HTTP request to the index action exposed by UserController. Because no role or permission check is performed server-side, the endpoint returns data or performs actions that should be restricted. See the GitHub Repository for CRM, GitHub Issue #3 Discussion, and VulDB CVE-2026-92402 for the current technical detail available.

No verified proof-of-concept code is published. Refer to the linked references for further investigation.

Detection Methods for CVE-2026-92402

Indicators of Compromise

• Unexpected HTTP requests to the UserControllerindex endpoint originating from low-privileged accounts.
• Access log entries where user IDs without administrative roles successfully hit user-management routes.
• Anomalous enumeration patterns against CRM user endpoints from a single session or IP.

Detection Strategies

• Instrument the application to log the authenticated principal and role for every request to UserController handlers.
• Compare observed access patterns against an authorization matrix that defines which roles may reach each controller action.
• Add server-side assertions that reject any request to index where the caller lacks the required role, and alert on rejected attempts.

Monitoring Recommendations

• Forward web server and application logs to a centralized analytics platform and build dashboards for controller-level access by role.
• Alert on repeated 200-series responses to UserController endpoints from accounts that should not have management access.
• Track spikes in requests to the CRM user endpoints outside business hours or from unusual geolocations.

How to Mitigate CVE-2026-92402

Immediate Actions Required

• Restrict network exposure of the ChangeWeDer CRM instance to trusted networks or authenticated VPN users until a patch is available.
• Enforce role-based access control in front of the UserControllerindex endpoint using a reverse proxy or web application firewall rule.
• Audit existing CRM accounts and revoke low-privilege accounts that do not require access to the affected system.

Patch Information

At the time of publication, the ChangeWeDer project had not responded to the reported issue and no fixed commit is identified. Monitor the GitHub Repository for CRM and GitHub Issue #3 Discussion for maintainer response and remediation commits.

Workarounds

• Add an authorization filter or Spring Security rule that requires an administrative role for all UserController routes.
• Place the CRM behind an authenticating reverse proxy that enforces role checks based on group membership before requests reach the application.
• Disable or remove the CRM deployment if it is not business-critical while the maintainer investigates the report.

# Example nginx location block enforcing an admin group header before proxying to CRM
location /user/ {
    if ($http_x_auth_role != "admin") {
        return 403;
    }
    proxy_pass http://crm-backend;
}