Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-4563 is an Insecure Direct Object Reference (IDOR) vulnerability in MacCMS version 2025.1000.4052 affecting the order detail API within the member center.'}, {'type': 'paragraph', 'content': 'The vulnerability occurs because the order_info() function retrieves order details based only on the provided order_id parameter without verifying that the order belongs to the currently authenticated user.'}, {'type': 'paragraph', 'content': "This means an authenticated user can guess or enumerate other users' order IDs and access their order details, bypassing authorization checks."}, {'type': 'paragraph', 'content': "For example, a user logged in as Alice can request order details for Bob's order_id and receive Bob's order information, including sensitive data such as order amounts, order codes, and remarks."}] [1]

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Impact Analysis

[{'type': 'paragraph', 'content': "This vulnerability can lead to unauthorized access to other users' order details, exposing sensitive business information."}, {'type': 'list_item', 'content': 'Leakage of confidential data such as order amounts, order codes, and order remarks.'}, {'type': 'list_item', 'content': 'Potential facilitation of social engineering or business abuse if order remarks contain payment or manual processing details.'}, {'type': 'paragraph', 'content': 'Because the exploit is publicly available and can be initiated remotely by authenticated users, it increases the risk of data breaches and misuse.'}] [1]

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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 monitoring API requests to the order_info endpoint for unauthorized access attempts where an authenticated user requests order details using order_id values that do not belong to them.'}, {'type': 'paragraph', 'content': "Detection methods include checking access audit logs for suspicious or unauthorized access to other users' order details."}, {'type': 'paragraph', 'content': "Since the vulnerability involves an authenticated user enumerating order_id values, commands or scripts can be used to analyze web server logs or API logs for patterns where order_info requests include order_id parameters that do not match the authenticated user's user_id."}, {'type': 'paragraph', 'content': 'Example commands might include searching logs for order_info API calls with mismatched user sessions and order_id values, such as using grep or similar tools on log files:'}, {'type': 'list_item', 'content': "grep 'order_info' /path/to/access.log | grep -v 'user_id=order_owner_user_id'"}, {'type': 'list_item', 'content': 'Analyze API request logs to identify requests where the order_id parameter is accessed by users other than the owner.'}, {'type': 'paragraph', 'content': 'Additionally, implementing access audit logs that record user_id and order_id pairs on each access can help detect unauthorized access attempts.'}] [1]

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Mitigation Strategies

[{'type': 'paragraph', 'content': "Immediate mitigation steps include adding ownership constraints in the order_info() function to ensure that the order_id is matched alongside the currently authenticated user's user_id."}, {'type': 'paragraph', 'content': 'Implement object-level authorization checks across all member APIs that retrieve resources by primary key to prevent unauthorized data access.'}, {'type': 'paragraph', 'content': 'Use non-enumerable, high-entropy order identifiers (such as random tokens) instead of predictable order_id values to prevent ID enumeration attacks.'}, {'type': 'paragraph', 'content': "Add access audit logging to detect and monitor unauthorized or suspicious access attempts to other users' orders."}] [1]

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