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A user who may call an endpoint is not automatically allowed to read or change every object whose ID they can submit. Before returning or changing a document, account, file, or other resource, the server must check whether the authenticated caller may perform that specific action on that specific object.
For example, two signed-in users may both be allowed to call GET /documents/{id}. If the handler simply fetches the supplied ID, one user may be able to replace their own document ID with another user’s and expose that record. The same design flaw can affect updates, deletions, exports, and administrative actions.
What does object-level authorization check?
Route or function authorization answers whether a caller may invoke an operation at all. Object-level authorization answers whether that caller may perform the requested operation on the particular resource named in the request.
Authentication establishes who the caller is; it does not grant access to every object ID that caller can name. A request can carry an identifier in a URL, query parameter, request body, filename, account number, slug, UUID, or GraphQL node ID. Treat each client-supplied reference as a request to locate a resource—not as proof of permission to use it.
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OWASP describes this class of API flaw as Broken Object Level Authorization (BOLA); it is also commonly discussed as Insecure Direct Object Reference (IDOR). OWASP’s guidance is that endpoints accepting an object identifier and acting on the object need checks involving the user, action, and object. Comparing a session user ID with one request parameter is not a general fix: access may depend on ownership, tenant membership, sharing relationships, or other policy rules.
How should a server make the decision?
- Establish trusted caller identity. Derive the user or service identity from the server-validated authentication context, not from an identity value the client can freely set in the request.
- Resolve the actual resource. Identify the object the operation will really read or change, including objects referenced indirectly or nested in the request.
- Evaluate the requested action against that object. Apply the relevant policy using trusted identity and context, which may include tenant, ownership, relationship, role, or other conditions.
- Enforce the result before returning data or performing the change. Apply the decision to every operation that touches the resource, not only to the most visible read endpoint.
A scoped data lookup can reduce the chance of accidentally returning an unauthorized record—for example, by querying only records available to the current tenant. But scoping must implement the real permission rules. It is not safe to assume every permitted object is directly owned by the current user; a user may have access through a team, a share, or another relationship.
Keep the check close enough to the protected resource that it can evaluate the object and action actually used. If a request is rerouted, changes the target object, or invokes a different operation downstream, the authorization decision must still match that effective action and resource.
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Why are unguessable IDs not authorization?
Random or complex identifiers can make enumeration harder, which is useful as defense in depth. They do not establish permission. A user may obtain another object’s identifier through a shared link, a log, a response, or another application path. The server must still reject a request when that caller lacks permission for the requested action on that object.
How do you test object-level authorization?
Use separate accounts—and, where applicable, separate tenants—with objects of the same type. Authenticate as one account, then substitute a reference to the other account’s object. OWASP’s REST Assessment Cheat Sheet calls this the “swap test”: create the same kind of object with two accounts or tenants, then replay each request under the other session’s identifiers.
- Create matching test objects under two distinct users or tenants.
- Record the requests that read, update, delete, export, or otherwise act on those objects.
- Replay each request while authenticated as the other account, changing the object reference but not the authenticated identity.
- Check that unauthorized reads disclose no protected data and unauthorized writes produce no change.
- Repeat for every object type and every endpoint or workflow that consumes an identifier.
Cover the relevant HTTP methods, including GET, PUT, PATCH, and DELETE, along with creation flows, exports, nested resources, and administrative operations where they exist. Passing the read test does not establish that the neighboring update or delete path is safe.
Test vertical access separately from cross-user access. A low-privilege user must not gain access to an administrator-only function merely because they are authorized for the particular object. Function-level authorization and object-level authorization answer different questions, so both need coverage.
How does this apply to GraphQL?
GraphQL can expose objects through direct node fields, nested edges, query resolvers, or mutations. Check permission on every path that returns or changes an object, including access through a parent’s nested data. A caller allowed to view a parent object is not necessarily allowed to view every related node.
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Which authorization model fits object-level rules?
The right model depends on how access is determined. A mixed design is common: roles can govern broad function access while attributes or relationships determine access to specific records. OWASP says attribute-based access control (ABAC) and relationship-based access control (ReBAC) should typically be preferred for application development when fine-grained object-level or contextual rules matter; role-based access control (RBAC) can suit simpler, coarser-grained permissions.
| Model | Decision basis | When it may fit |
|---|---|---|
| RBAC | Permissions assigned to roles. | Broad permissions with relatively simple role distinctions. |
| ABAC | Attributes of the subject, object, environment, and policy. | Rules that depend on resource properties or context, such as time, device, location, or current training status. |
| ReBAC | Relationships between users and resources. | Rules such as whether a requester created a post or belongs to a resource’s sharing circle. |
When choosing or combining models, consider whether access mostly follows roles or per-object ownership and sharing; whether context changes the decision; and how policy complexity, role growth, review, and testing will be managed. No single model is right for every application.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is a gateway check enough?
A gateway or proxy can enforce coarse-grained rules, but it may not cover direct service access, internal calls, alternate endpoints, or routing changes that affect which resource is reached. Ensure downstream services validate trusted authorization context against the actual action and object, or place enforcement close to the protected resource.
If a gateway passes identity or authorization data in headers, remove client-provided copies of trusted headers before setting them. Re-evaluate the decision if the action or target resource changes; a check for one route or object does not automatically authorize another.
Can a policy engine help?
A policy engine such as Open Policy Agent (OPA) can separate policy decisions from application enforcement and integrate with microservices, API gateways, and other infrastructure. It does not remove the application’s responsibility to provide trustworthy context or enforce the decision for the correct action and object.
OPA’s API documentation states that authentication and authorization default to off. Operators exposing the API must configure those protections rather than assume the policy engine enables them automatically.
How can teams prevent authorization regressions?
Maintain an authorization matrix and automate checks as features and releases change. OWASP describes the core dimensions as feature and logical role, with data sometimes added to represent filtering at the business-record level.
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- Map the roles and other relevant policy conditions to permitted actions.
- Include record-level or tenant-level scope where access depends on specific data.
- Re-run the swap tests when a feature, role, data path, or policy changes.
There is no prevalence percentage established here for how often BOLA occurs. OWASP API Security Top 10 API1:2023 is a category designation, not a measured prevalence statistic.
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