IDOR Vulnerability in HRM Employee Management Function

Insecure Direct Object Reference (IDOR) Vulnerability in Employee Management Functionality Vulnerability Overview Vulnerability Type: Insecure Direct Object Reference (IDOR) Severity: Critical OWASP Classification: OWASP Top 10 2025 - A01: Broken Access Control Impact Scope Affected Endpoints: - - Technical Description The application uses predictable, user-controlled employee identifiers to retrieve employee records. The server does not verify whether the currently authenticated user has permission to access the requested resource. By modifying the or parameter values, records for other employees and administrative users can be accessed. Reproduction Steps 1. Log in to the HRM application using a valid employee account. 2. Navigate to employee-related endpoints, such as: 3. Modify the parameter value to another valid identifier: 4. Observe that the application returns the record for another employee without performing an authorization check. 5. Repeat the same process for . 6. Observe that unauthorized employee/administrative profile information becomes accessible. Proof of Concept (PoC) Successful exploitation of this vulnerability enables: - Access to employee records belonging to other users - Access to administrator profile information - Enumeration of valid employee identifiers - Viewing of sensitive employee details without authorization Security Impact An attacker exploiting this vulnerability may be able to: - Access confidential employee information - Enumerate valid users/accounts - Access administrator records - Modify sensitive user information - Abuse administrative functions - Perform privilege escalation attacks Root Cause Analysis The application relies on user-supplied object identifiers without implementing appropriate server-side authorization checks to verify resource ownership or access rights. Remediation Recommendations Implement strict server-side authorization checks Verify that users can only access resources they own or are explicitly authorized to access Avoid exposing predictable sequential identifiers Implement Role-Based Access Control (RBAC) Use indirect object references wherever possible Log and monitor unauthorized access attempts Conduct regular access control security reviews Conclusion The identified IDOR vulnerability allows authenticated users to access unauthorized employee and administrative records by manipulating user-controlled identifiers. Due to the lack of appropriate authorization controls, attackers can access sensitive information and potentially escalate privileges. Immediate remediation is strongly recommended.

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IDOR Vulnerability in HRM Employee Management Function