OWASP API 9 : Improper Inventory Management


It’s worth noting that the issue of “Improper Inventory Management” has gained prominence in API security and is currently ranked at No. 9 in the OWASP Top 10 API list, replacing the 2019 entry “Improper Assets Management.” This highlights its significance and the need for organizations to take proactive steps in addressing this vulnerability to safeguard their digital assets and sensitive data. 

Using Application Programming Interfaces (APIs) has become a fundamental part of modern software development. APIs enable different software components to communicate and interact seamlessly. However, with this growing reliance on APIs comes an increased risk if they are not managed properly. One of the key vulnerabilities that organizations face is improper inventory management of APIs. In this blog post, we’ll explore what improper inventory management entails, examine its potential threats, and provide suggestions for remediation.

Understanding Improper Inventory Management

Improper inventory management of APIs refers to the inadequate tracking, documentation, and control of these essential components within an organization. It involves the absence of a clear understanding of an API’s purpose, environment, version, and data flow. The main issues associated with improper inventory management are:

  • Running Unpatched Systems
  • Unnecessarily Exposed API Hosts
  • Lack of Retirement Strategies
  • Incomplete Documentation

Let’s delve into these issues and their implications for API security.

  1. Running Unpatched Systems: Keeping APIs up to date with the latest security patches and updates is vital for safeguarding your organization against potential vulnerabilities and data breaches. When APIs are not regularly updated, they become susceptible to exploitation by cybercriminals. These outdated systems can serve as entry points for attackers, jeopardizing the security of your entire network.
  2. Unnecessarily Exposed API Hosts: The advent of modern software development practices, such as microservices, has made it easier to deploy and expose API hosts. While this can lead to increased efficiency and scalability, it can also expose your APIs to unnecessary risks if proper inventory management practices are not in place. Unnecessarily exposed API hosts provide attackers with more opportunities to infiltrate your system, making them a prime target for exploitation.
  3. Lack of Retirement Strategies: Organizations often have multiple versions of APIs running concurrently. Without a well-defined retirement plan for each API version, outdated and deprecated endpoints may still be accessible. Attackers can exploit known vulnerabilities in these endpoints, posing a significant security threat. An effective strategy for retiring outdated APIs is essential to maintain a secure environment.
  4. Incomplete Documentation: Accurate and up-to-date documentation is crucial for understanding how APIs work, how they should be used, and how they can be secured. Incomplete or outdated documentation makes it challenging to identify and rectify vulnerabilities. Additionally, it can lead to confusion and misconfiguration, which can increase the risk of security issues.


Remediation Strategies

Proper inventory management is critical to ensure the security and integrity of APIs. Here are some strategies to address the vulnerabilities associated with improper inventory management:

  • Comprehensive Documentation: Document each API’s purpose, environment, version, and data flow. Ensure that documentation is updated regularly to reflect any changes or updates in the API.
  • Patch and Update Regularly: Keep APIs and associated systems up to date with the latest security patches and updates to mitigate known vulnerabilities.
  • Access Control: Implement proper access controls to limit the exposure of API hosts. Only authorized personnel should have access to APIs, reducing the risk of unauthorized access
  • Retirement Plan: Develop a clear strategy for retiring outdated API versions, ensuring that deprecated endpoints are no longer accessible.
  • Risk Analysis: Perform a thorough risk analysis when introducing new API versions. This analysis will help identify potential security risks and enable you to take appropriate measures to mitigate them.



Proper inventory management of APIs is a fundamental aspect of maintaining a secure and resilient digital ecosystem. Organizations must prioritize tracking, documenting, and controlling their APIs to mitigate potential security threats. By addressing the vulnerabilities associated with improper inventory management, organizations can enhance their API security, protect sensitive data, and maintain the trust of their customers and partners in an increasingly interconnected world.



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