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It targets developers, product owners, and other stakeholders, and also addresses consumers of API services. The guideline is built by reviewing common API security vulnerabilities from existing studies, then expanding its coverage across the API service development lifecycle. 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Prof. Cihangir TEZCAN  \n(METU)  \nStudent Name:  \nOkan AKGÜNDÜZ  \nDepartment of Cyber Security  \nJanuary 2025  \nTECHNICAL REPORT  \nMETU/II-TR-2025-  \nOrta Doğu Teknik Üniversitesi  \nEnformatik Enstitüsü  \nYAZILIM GELİŞTİRİCİLERİ VE ÜRÜNYÖNETİCİLERİ İÇİN API GÜVENLİĞİ KILAVUZU  \nDanışman Adı:  \nDoç . Dr. Cihangir TEZCAN  \n(ODTÜ)  \nÖğrenci Adı:  \nOkan AKGÜNDÜZ  \nSiber Güvenlik Bölümü  \nOcak 2025  \nTEKNİK RAPOR  \nODTÜ/II-TR-2025-  \n\n| REPORT DOCUMENTATION PAGE |  |  |\n| --- | --- | --- |\n| 1. AGENCY USE ONLY (Internal Use) | 2. REPORT DATE\u003Cbr>10.01.2025 |  |\n| 3. TITLE AND SUBTITLE\u003Cbr>API SECURITY GUIDELINE FOR DEVELOPERS AND PRODUCT OWNERS |  |  |\n| 4. AUTHOR (S)\u003Cbr>Okan Akgündüz | 5. REPORT NUMBER (Internal Use)\u003Cbr>METU/II-TR-2025- |  |\n| 6. SPONSORING/ MONITORING AGENCY NAME(S) AND SIGNATURE(S)\u003Cbr>Cyber Security Master’s Programme, Department of Cyber Security, Informatics Institute, METU\u003Cbr>Advisor: Assoc. Prof. Cihangir Tezcan Signature: |  |  |\n| 7. SUPPLEMENTARY NOTES |  |  |\n| 8. ABSTRACT (MAXIMUM 200 WORDS)\u003Cbr>This report provides a survey for security topics, practices, and recommendations to consider when designing, developing, and maintaining an API service. It is primarily intended for developers, product owners, and other stakeholders involved in API development. Additionally, it is relevant to those who consume API services.\u003Cbr>The report draws from widely recognized security standards, guidelines, and surveys. It is created by examining the most common API security vulnerabilities identified in existing studies. Its scope of work is then expanded to include potential vulnerabilities that can arise during an API service’s development process/lifecycle. For each identified vulnerability/risk/issue, the report outlines recommended mitigations based on standards and guidelines.\u003Cbr>The result is a categorized list that can be used as an API Security Guideline. |  |  |\n| 9. SUBJECT TERMS |  | 10. NUMBER OF PAGES 43 |\n\nTABLE OF CONTENTS  \nTABLE OF CONTENTS ........................................................................................................................... IV  \n1. INTRODUCTION ................................................................................................................................ 1  \n2. PROJECT INITIATION AND DESIGN ........................................................................................... 3  \n2.1. PD01-Neglecting Security in Early Steps.......................................................................................... 3  \n2.2. PD02-No “Secure by Default” Approach .......................................................................................... 4  \n2.3. PD03-Not Documenting Service Internals ........................................................................................ 5  \n2.4. PD04-Not Documenting Role and Privilege Definitions................................................................... 5  \n2.5. PD05-Lack of Fail-Safe/Fail-Secure Approach................................................................................. 6  \n2.6. PD06-Lack of Documentation for Users ........................................................................................... 6  \n2.7. PD07-Lack of Understanding of Performance Requirements ........................................................... 7  \n2.8. PD08-Not Identifying Data and API Service Components ............................................................... 7  \n2.9. PD09-Lack of Security Awareness .................................................................................................... 8  \n3. SOFTWARE DEVELOPMENT ......................................................................................................... 9  \n3.1. SD01-Sharing Too Much Data in Responses and Error Messages .................................................... 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For each vulnerability, risk, or issue, it outlines recommended mitigations based on security standards and guidelines.\"},{\"question\":\"What stages does the guideline cover in the API service lifecycle?\",\"answer\":\"It covers early project initiation and design, software development practices, and authentication and authorization considerations, with risks documented as specific issues and mitigations.\"}]","API SECURITY GUIDELINE FOR DEVELOPERS AND PRODUCT OWNERS - API Security Guideline | PDF",1791925605]