Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-3764 is a critical security vulnerability in SourceCodester Client Database Management System (CDMS) version 1.0, specifically in the file superadmin_user_update.php. The vulnerability arises because the system does not perform proper authorization checks before processing user update requests.'}, {'type': 'paragraph', 'content': "An unauthenticated attacker can send a crafted POST request to this endpoint with parameters such as user_id, firstname, lastname, username, role, department_assignment, and id_number. Because there is no session validation or role verification, the attacker can escalate privileges by changing a user's role to superadmin without any authentication."}, {'type': 'paragraph', 'content': 'This results in a complete bypass of access controls, allowing the attacker to gain full administrative privileges.'}] [1, 2, 3]

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Impact Analysis

The vulnerability allows an attacker to escalate privileges to superadmin without authentication, granting them full administrative control over the system.

• Modify or delete user accounts
• Remove managers
• Manipulate system data
• Compromise the confidentiality, integrity, and availability of the system

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': "This vulnerability can be detected by attempting to send a crafted POST request to the vulnerable endpoint `/cdm/superadmin_user_update.php` with parameters such as `user_id=32`, `firstname=Test`, `lastname=User`, `username=testuser`, `role=superadmin`, `department_assignment=IT`, and `id_number=ID999`. If the request succeeds and the user's role is updated to superadmin without authentication, the system is vulnerable."}, {'type': 'paragraph', 'content': 'Additionally, attackers or defenders can use Google dorking with the query `inurl:superadmin_user_update.php` to identify potentially vulnerable targets.'}, {'type': 'paragraph', 'content': 'Example command using curl to test the vulnerability:'}, {'type': 'list_item', 'content': 'curl -X POST https://[target]/cdm/superadmin_user_update.php -d "user_id=32&firstname=Test&lastname=User&username=testuser&role=superadmin&department_assignment=IT&id_number=ID999"'}, {'type': 'paragraph', 'content': "If the response indicates success and subsequent database verification shows the user's role changed to superadmin, the vulnerability is confirmed."}] [1, 3]

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Mitigation Strategies

[{'type': 'paragraph', 'content': 'The immediate mitigation is to implement proper session validation and role-based access control in the vulnerable script. This includes requiring authenticated sessions and verifying that the user’s role is superadmin before processing any requests to update user details.'}, {'type': 'paragraph', 'content': 'An example fix involves adding code such as:'}, {'type': 'list_item', 'content': "```php\ninclude 'superadmin_session.php';\nif ($_SESSION['role'] !== 'superadmin') {\n exit('Unauthorized');\n}\n```"}, {'type': 'paragraph', 'content': 'This ensures unauthorized requests are rejected, preventing privilege escalation.'}, {'type': 'paragraph', 'content': 'If possible, consider replacing the affected component with an alternative product that properly enforces authorization checks.'}] [1, 3]

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