API3:2023: Broken Object Property Level Authorization
Combines the former Excessive Data Exposure (over-returning fields) and Mass Assignment (over-accepting fields) into one category covering field-level authorization failures.
How it's found
Detected by adding and removing fields in API requests (mass assignment) and comparing responses against the expected schema to catch over-exposed or over-accepted properties.
Vulnerable vs. safe
PATCH /api/users/42 { "name": "Jo", "isAdmin": true } -> accepted and appliedPATCH /api/users/42 { "name": "Jo", "isAdmin": true } -> isAdmin stripped by an allowlisted field schemaStandards mapping
Where this fits in a TurboPentest engagement
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Frequently asked questions
What is API3:2023 Broken Object Property Level Authorization?
Combines the former Excessive Data Exposure (over-returning fields) and Mass Assignment (over-accepting fields) into one category covering field-level authorization failures.
How do you find Broken Object Property Level Authorization?
Detected by adding and removing fields in API requests (mass assignment) and comparing responses against the expected schema to catch over-exposed or over-accepted properties.
Which CWEs map to API3:2023?
API3:2023 maps to CWE-213, CWE-915, CWE-200.
Does TurboPentest test for Broken Object Property Level Authorization?
This weakness is not covered by the automated black-box pentest. IntegSec pentesters cover it in a manual engagement.
Related OWASP categories
- OWASP API Security Top 10API1:2023: Broken Object Level Authorization
- OWASP API Security Top 10API2:2023: Broken Authentication
- OWASP API Security Top 10API4:2023: Unrestricted Resource Consumption
- OWASP API Security Top 10API5:2023: Broken Function Level Authorization
- OWASP API Security Top 10API6:2023: Unrestricted Access to Sensitive Business Flows
- OWASP API Security Top 10API7:2023: Server Side Request Forgery (SSRF)
Written and reviewed by
Michel Chamberland - Founder & CEO, IntegSec
CISSP, OSCP, OSCE, CEH, GIAC, CCSK · 20+ years in offensive security
Michel has spent 20+ years on offensive security teams including IBM X-Force Red and Trustwave SpiderLabs, leading penetration tests, red team engagements, and breach response for Fortune 500 customers. He is the founder of IntegSec and the architect of TurboPentest.
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