Broken Object Level Authorization, commonly called BOLA, is one of the most serious API security risks because it allows authenticated users to access objects they do not own or should not be allowed to view, modify, delete, export, or control.
BOLA is not an authentication failure. The attacker may be properly logged in. The failure occurs when the API does not verify whether that authenticated user is authorized to access the specific object requested.
A simple change to an object identifier such as a user ID, account ID, invoice ID, file ID, tenant ID, order ID, ticket ID, or transaction ID may expose sensitive records, customer data, business workflows, administrative actions, or cross-tenant information.
Redbot Security validates BOLA and related API authorization weaknesses through web application and API penetration testing, API security testing and compliance validation, cloud security testing, AI / LLM security testing, and red team operations.
What Is Broken Object Level Authorization?
Broken Object Level Authorization is an API vulnerability where an application fails to verify whether a user is allowed to access a specific object. The user may be authenticated, but the API does not enforce ownership or authorization at the object level.
APIs commonly expose object identifiers in URLs, request bodies, GraphQL queries, headers, or parameters. If the API accepts a modified identifier without checking ownership, attackers may access objects belonging to other users, customers, tenants, departments, or organizations.
BOLA is especially common in APIs because APIs are designed to expose structured data and object-based operations. Attackers can test authorization boundaries by changing IDs, guessing identifiers, enumerating resources, or replaying requests across accounts.
The user may have a valid session or token. The issue is that the API fails to verify whether that user should access the exact object being requested.
How BOLA Attacks Work
A BOLA attack usually begins with a legitimate authenticated request. The attacker captures a request to access one of their own objects, then changes the object identifier to reference another user’s object.
If the API responds with the other object’s data, performs an action against it, or returns a different authorization state, the endpoint may be vulnerable.
| Attack Step | What the Attacker Does | Security Failure |
|---|---|---|
| Authenticate | Logs in with a valid user account or token | The attacker is a legitimate user |
| Capture Request | Observes an API request containing an object ID | The object identifier is user-controllable |
| Modify Identifier | Changes the user ID, file ID, account ID, order ID, or tenant ID | The API accepts the modified identifier |
| Access Object | Receives another user’s data or performs an unauthorized action | Object-level authorization is missing or weak |
| Scale the Attack | Enumerates additional object IDs or automates requests | Rate limiting, monitoring, and authorization controls fail |
BOLA testing requires comparing requests across multiple users, roles, tenants, and object ownership states. Automated scanners often miss these flaws because they do not understand business context or user authorization relationships.
Common BOLA Examples
BOLA can appear in almost any API that exposes object identifiers. The risk increases when APIs handle sensitive data, financial transactions, customer records, tenant boundaries, support workflows, files, health records, cloud resources, or administrative functions.
BOLA vulnerabilities can expose sensitive information quietly because the requests may look normal. The attacker is authenticated, the endpoint is valid, and the API may return a standard success response.
Why BOLA Is Dangerous
BOLA is dangerous because it often creates direct access to sensitive business data without requiring exploit chains, malware, or infrastructure compromise. A single weak endpoint can expose large volumes of customer records, documents, transactions, tickets, or internal data.
In multi-tenant SaaS applications, BOLA can become a major cross-tenant data exposure issue. In regulated environments, it can create compliance failures affecting PCI DSS, HIPAA, SOC 2, ISO 27001, privacy obligations, and customer security commitments.
| Impact Area | BOLA Risk |
|---|---|
| Data Exposure | Unauthorized users access customer records, invoices, files, tickets, or account data |
| Tenant Isolation Failure | One customer or workspace can access another tenant’s data |
| Account Manipulation | Attackers modify settings, workflows, permissions, or records they do not own |
| Compliance Exposure | Regulated information is exposed through weak API authorization |
| Business Logic Abuse | Attackers manipulate orders, approvals, refunds, subscriptions, or account workflows |
| Reputation Damage | Customers lose trust after cross-account or cross-tenant data exposure |
The request can look like normal API traffic, which means weak logging, monitoring, and authorization checks may allow abuse to continue unnoticed.
BOLA vs Broken Function Level Authorization
BOLA is sometimes confused with Broken Function Level Authorization. Both are authorization vulnerabilities, but they affect different security boundaries.
BOLA involves access to specific objects. Broken Function Level Authorization involves access to restricted actions or functions.
| Category | BOLA | Broken Function Level Authorization |
|---|---|---|
| Security Boundary | Specific object or resource | Specific function or operation |
| Example | User accesses another user’s invoice by changing invoice ID | Standard user calls an admin-only export endpoint |
| Primary Question | Is this user allowed to access this object? | Is this user allowed to perform this action? |
| Testing Method | Compare object access across users, roles, tenants, and ownership states | Compare function access across roles, privilege levels, and endpoint permissions |
| Common Impact | Data exposure, cross-tenant access, unauthorized object modification | Privilege escalation, unauthorized administrative actions, workflow abuse |
Strong API penetration testing should validate both object-level authorization and function-level authorization because attackers frequently combine both weaknesses to expand impact.
BOLA in SaaS and Multi-Tenant Applications
SaaS applications are especially vulnerable to high-impact BOLA because they often separate customers, workspaces, organizations, teams, projects, or accounts using object identifiers and tenant logic.
If tenant isolation is not enforced consistently at the API level, attackers may access another tenant’s documents, users, billing records, reports, settings, integrations, or administrative functions.
Multi-tenant BOLA testing should include multiple test accounts across separate organizations, different roles inside each tenant, service accounts, invited users, external users, administrators, and suspended or deprovisioned users.
BOLA in Cloud, AI, and API Integrations
Modern APIs rarely operate in isolation. They often connect to cloud services, SaaS platforms, AI systems, RAG pipelines, agents, workflow tools, and internal business systems.
BOLA can become more dangerous when object-level authorization failures exist inside APIs used by AI agents, cloud automation, service accounts, or internal orchestration workflows.
| Integration Area | BOLA Risk |
|---|---|
| Cloud APIs | Weak object authorization exposes storage objects, logs, resources, or tenant data |
| AI Agent APIs | Agents retrieve or modify objects using broad tool permissions |
| RAG Retrieval APIs | AI systems retrieve documents outside the user’s ownership or role boundary |
| SaaS Integrations | OAuth integrations expose customer objects, tickets, files, or records |
| Workflow Automation | Approval, refund, order, or ticket workflows act on unauthorized object IDs |
Organizations deploying AI-connected APIs should combine API security testing with AI and LLM security testing, RAG testing, and prompt injection testing.
If an AI agent or retrieval system can call vulnerable APIs, attackers may manipulate prompts or workflows to access objects the user should not reach.
How to Test for BOLA
Testing for BOLA requires more than sending random API requests. Effective testing requires multiple users, multiple roles, multiple ownership states, multiple tenants, valid objects, invalid objects, and business workflow context.
The goal is to determine whether every object access decision is enforced server-side based on the authenticated user’s actual authorization.
BOLA testing should be performed manually for critical APIs because the tester must understand object ownership, business rules, user relationships, and real-world impact.
How to Prevent BOLA
Preventing BOLA requires consistent server-side authorization checks for every object access. APIs must verify that the authenticated user, token, role, tenant, or service account is allowed to perform the requested action on the requested object.
Object-level authorization should be implemented as a default security pattern across the API architecture rather than relying on developers to remember checks individually for every endpoint.
| Control | Security Objective |
|---|---|
| Server-Side Authorization | Verify object ownership and permissions on every request |
| Deny by Default | Reject access unless authorization is explicitly granted |
| Centralized Authorization Logic | Reduce inconsistent object checks across endpoints and services |
| Tenant Isolation | Ensure every query and object lookup is tenant-aware |
| Scoped Tokens | Limit API tokens and service accounts to specific objects, tenants, or actions |
| Audit Logging | Track object access anomalies, enumeration attempts, and authorization failures |
| Regression Testing | Continuously test object access boundaries as APIs change |
UUIDs and unpredictable identifiers can make enumeration harder, but they do not fix BOLA. The API must still enforce authorization for every object access.
How Redbot Tests BOLA and API Authorization
Redbot Security tests BOLA by validating object-level authorization across real application workflows, user roles, tenants, object ownership states, API tokens, service accounts, cloud integrations, and AI-connected API workflows.
The goal is to identify whether attackers can access, modify, delete, export, infer, or manipulate objects outside their authorization scope.
| Testing Area | Validation Objective |
|---|---|
| Object Ownership | Confirm users can only access objects they own or are explicitly allowed to use |
| Tenant Isolation | Validate separation between customers, workspaces, organizations, or accounts |
| Role-Based Access | Test differences between standard users, managers, admins, external users, and service accounts |
| Workflow Actions | Test read, update, delete, export, approve, share, and administrative object actions |
| Cloud and SaaS APIs | Evaluate object access across integrations, service accounts, OAuth scopes, and cloud resources |
| AI-Connected APIs | Validate whether AI agents, RAG systems, or tools can access unauthorized objects |
Redbot delivers practical evidence, exploit narratives, remediation guidance, and retesting support for organizations that need API authorization validation across modern application, SaaS, cloud, and AI environments.
Mature API security requires validating object-level access across users, roles, tenants, workflows, cloud integrations, and AI-connected systems under realistic attacker conditions.
What is Broken Object Level Authorization?
Broken Object Level Authorization is an API vulnerability where an authenticated user can access, modify, delete, or control an object they do not own or should not be allowed to access.
Is BOLA an authentication issue?
No. BOLA is an authorization issue. The attacker may be properly authenticated, but the API fails to verify whether that user is allowed to access the specific object requested.
How do attackers exploit BOLA?
Attackers usually exploit BOLA by capturing a valid API request and changing an object identifier such as a user ID, account ID, file ID, invoice ID, order ID, ticket ID, or tenant ID.
Why is BOLA common in APIs?
BOLA is common in APIs because APIs frequently expose object identifiers and rely on backend logic to enforce ownership. If object-level authorization checks are missing or inconsistent, unauthorized access may occur.
Can automated scanners find BOLA?
Automated scanners may detect some simple authorization issues, but BOLA often requires manual testing across users, roles, tenants, object ownership states, and business workflows.
How can organizations prevent BOLA?
Organizations can prevent BOLA by enforcing server-side object-level authorization on every request, using deny-by-default logic, centralizing authorization checks, validating tenant boundaries, and testing object access continuously.
How does Redbot Security test for BOLA?
Redbot Security tests BOLA by validating object access across multiple users, roles, tenants, tokens, workflows, service accounts, cloud integrations, and AI-connected API paths using manual API penetration testing.
References
Application & API Testing
Web application and API authorization validation.
Cloud Testing
Cloud API, IAM, and service-to-service trust validation.
AI / LLM Security
AI agent, RAG, prompt injection, and API tool security testing.
Network Testing
Internal and external infrastructure attack-path validation.
Red Team Operations
Advanced adversarial simulation across enterprise attack surfaces.
API Security Testing & Compliance
Learn how API testing validates authorization, compliance, and sensitive workflows.
RAG Testing and AI Validation
Understand how retrieval systems can expose object-level access-control failures.
AI Data Leakage Risk
See how sensitive data leaks through prompts, retrieval, memory, tools, and APIs.
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