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A lending platform has to manage several types of users, and each user needs a very different level of access.
A customer should be able to create a loan application, upload documents, view repayment schedules, and track application status. A loan officer may need to review applications, verify documents, request additional information, and recommend or process lending decisions. An administrator may need to manage users, configure lending products, monitor platform activity, and oversee system operations.
Giving all three users access to the same functionality creates unnecessary security and operational risks.
The better approach is to implement Role-Based Access Control (RBAC) with clearly defined permissions and business rules.
NIST defines RBAC as an access-control model where permitted actions on resources are associated with roles rather than individual users. This allows permissions to reflect organizational responsibilities and makes access management easier to administer.
For a lending platform, however, simply creating three roles called customer, loan_officer, and admin is not enough.
The platform must also determine:
This article explains how to design and implement these three roles securely and efficiently.
The first step is to understand that a role is not simply a label attached to a user.
A role represents a collection of responsibilities and associated permissions.
For example:
A customer interacts with the lending platform to obtain financial services.
Typical activities include:
A loan officer works on behalf of the lending organization.
Typical activities include:
An administrator manages the platform or organizational configuration.
Depending on the organization, an administrator may:
These responsibilities should translate into explicit permissions.
NIST’s RBAC model describes roles as organizational functions and permissions as authorizations associated with those roles.
A lending platform processes highly sensitive information.
A single loan application can contain:
Not every employee needs access to every piece of information.
For example, a customer should not be able to see internal underwriting notes.
A loan officer should not automatically be able to modify platform-wide settings.
An administrator should not automatically be able to impersonate customers or approve every financial decision without appropriate controls.
This is why authorization needs to be designed before development.
OWASP recommends designing authorization up front, enforcing access controls on requests, using deny-by-default behavior, applying least privilege, logging authorization events, and testing authorization rules.
The customer is the external user who applies for or manages a loan.
The customer role should generally be limited to the customer’s own information.
A customer should typically be able to:
The customer should generally not be able to:
The loan officer is an internal operational role.
The biggest design mistake here is giving every loan officer access to every loan application.
Instead, consider assigning applications to specific officers or teams.
For example:
Loan Officer A
↓
Assigned Applications
↓
Customer → Application → Documents
The officer should only see the applications they are authorized to handle.
Typical permissions may include:
Depending on organizational policy, a loan officer may not have permission to:
The administrator is the highest-privilege role in this basic model.
However, “admin” should not automatically mean unrestricted access.
This is an important architectural principle.
Instead of:
Admin = Everything
consider creating more specific administrative permissions.
For example:
This allows the organization to create specialized administrators later.
For example:
Manages users and roles.
Manages loan products and lending configurations.
Manages compliance-related workflows.
Manages technical configuration.
This approach reduces excessive privilege.
OWASP specifically recommends avoiding global administrator accounts where possible and suggests controls such as just-in-time and just-enough access for highly sensitive accounts.
A basic permission matrix can look like this:
| Function | Customer | Loan Officer | Admin |
| Manage own profile | Yes | Yes | Yes |
| Create loan application | Yes | No | Yes |
| View own application | Yes | No | Yes |
| View assigned applications | No | Yes | Yes |
| View all applications | No | No | Yes |
| Upload customer documents | Yes | No | Yes |
| Review documents | No | Yes | Yes |
| Add internal notes | No | Yes | Yes |
| Request documents | No | Yes | Yes |
| Submit application | Yes | No | Yes |
| Recommend loan decision | No | Yes | Yes |
| Approve loan | No | Policy dependent | Policy dependent |
| View repayment schedule | Own only | Assigned customers | Yes |
| Manage users | No | No | Yes |
| Assign roles | No | No | Yes |
| Configure loan products | No | No | Yes |
| View audit logs | No | Limited | Yes |
| Manage system settings | No | No | Yes |
This is only a starting point.
The actual matrix should be created from the lender’s business and regulatory requirements.
A clean architecture separates users, roles and permissions.
The relationship should look like:
User
↓
Role
↓
Permission
↓
Resource
↓
Action
For example:
John
↓
Loan Officer
↓
application.review
↓
Loan Application
↓
Review
This approach is preferable to hardcoding:
if user.email == “john@example.com”
or:
if user.is_admin == true
The latter approach becomes difficult to maintain as the platform grows.
NIST notes that RBAC associates permissions with roles and assigns users to roles, allowing access administration to align with organizational responsibilities.
A basic implementation might use the following tables.
id
name
password_hash
status
organization_id
created_at
updated_at
id
name
description
created_at
updated_at
Example:
1 | customer
2 | loan_officer
3 | admin
id
resource
action
description
Example:
1 | application | create
2 | application | read
3 | application | update
4 | application | review
5 | application | approve
6 | user | manage
role_id
permission_id
user_id
role_id
loan_id
loan_officer_id
assigned_at
assigned_by
id
actor_id
action
resource_type
resource_id
timestamp
ip_address
metadata
This structure provides flexibility as the platform grows.
This is one of the most important parts of implementing customer authorization.
Suppose:
Customer A
Customer ID = 1001
and:
Customer B
Customer ID = 1002
Customer A requests:
GET /api/loans/1002
The system must not simply check:
user.hasPermission(“loan.read”)
It must also verify:
loan.customer_id == authenticated_user.customer_id
Otherwise, a customer could manipulate an identifier and access another customer’s loan.
OWASP specifically recommends restricting direct object references to authorized users to mitigate insecure direct object references and broken object-level authorization.
The authorization decision therefore becomes:
Does the user have permission?
+
Does the resource belong to the user?
+
Is the resource accessible in this context?
A lending platform often needs more than a simple loan_officer role.
It also needs to know which applications the officer can access.
Consider:
Loan Officer A
|
+– Loan #1001
+– Loan #1007
+– Loan #1012
Loan Officer B might have:
Loan Officer B
|
+– Loan #1002
+– Loan #1005
The authorization check should therefore consider:
role = loan_officer
and:
loan.assigned_officer_id = current_user.id
This prevents a loan officer from browsing unrelated applications.
For larger organizations, assignment can be team-based:
Loan Officer
↓
Loan Team
↓
Loan Applications
This makes the model more scalable.
A lending application typically progresses through several stages.
For example:
Draft
↓
Submitted
↓
Under Review
↓
Documents Required
↓
Verified
↓
Decision Pending
↓
Approved / Rejected
↓
Disbursed
↓
Repayment
↓
Closed
Different roles may be allowed to perform different state transitions.
For example:
Draft → Submitted
Submitted → Under Review
Under Review → Documents Required
Documents Required → Under Review
Under Review → Decision Pending
May have broader workflow-management permissions.
This is more secure than allowing every authenticated user to modify application_status.
The application workflow should be enforced by business logic.
For example:
Customer submits application
↓
System validates required fields
↓
Application enters review queue
↓
Loan officer receives assignment
↓
Officer reviews application
↓
Officer verifies documents
↓
Additional information requested?
/ \
Yes No
| |
↓ ↓
Customer Decision
responds process
|
↓
Review continues
The backend should validate each transition.
A malicious user should not be able to send:
status=approved
and bypass the underwriting workflow.
Loan applications frequently contain sensitive documents.
Examples include:
A customer should typically access their own documents.
A loan officer should access documents for authorized applications.
An administrator may have broader access depending on policy.
Document authorization should happen when the document is requested, not only when the application page is opened.
For example:
GET /documents/abc123
should verify:
Can this user access document abc123?
The system should not assume authorization simply because the user knows the document identifier.
Financial information often requires additional restrictions.
Consider a customer profile containing:
annual_income
credit_score
bank_account
employment_history
A loan officer might need all of these fields.
A support employee might need only:
name
application_status
contact_information
An administrator might have access based on their responsibilities.
This is where field-level authorization can become valuable.
OWASP’s current ASVS authorization guidance recommends restricting access at function, data and field levels where required.
A typical loan officer permission set might include:
customer.read
application.read
application.update
application.review
application.add_note
application.request_documents
document.read
document.verify
application.recommend
But permissions should also be scoped.
For example:
application.read.assigned
is more meaningful than:
application.read.all
Similarly:
customer.read.assigned
may be preferable to unrestricted customer access.
A basic admin role could include:
user.read
user.create
user.update
user.disable
role.assign
application.read
loan_product.read
loan_product.create
loan_product.update
audit.read
report.read
report.export
system_config.read
system_config.update
However, avoid automatically adding:
database.direct_access
or:
everything=true
Administrative authority should still follow least privilege.
A lending platform may eventually need multiple internal roles.
For example:
Loan Officer
↓
Reviews application
Underwriter
↓
Makes credit decision
Approver
↓
Approves high-value loan
Operations
↓
Processes disbursement
The same individual should not necessarily be able to perform every step.
NIST’s RBAC model explicitly includes constraints and separation-of-duty concepts, making them relevant when designing authorization policies.
For example:
Loan Officer A
creates/recommends
Loan Officer A
cannot approve own recommendation
This prevents a potentially serious control weakness.
The backend API should be the primary enforcement point.
Consider:
POST /api/applications
Required permission:
application.create
For a customer:
application.create.own
For a loan officer:
Possibly:
application.create.on_behalf
For an administrator:
application.create.any
Each operation should define its authorization requirements explicitly.
OWASP recommends forcing requests through access-control checks and denying requests by default unless they are specifically permitted.
The frontend should reflect the user’s permissions.
For example, a customer dashboard might display:
My Applications
My Documents
My Loans
Repayments
Profile
A loan officer dashboard might display:
Assigned Applications
Pending Reviews
Document Verification
Customer Requests
Loan Decisions
An admin dashboard might display:
Users
Loan Products
Applications
Reports
Audit Logs
System Settings
But frontend controls are only for usability.
They are not security boundaries.
An attacker can bypass the frontend and call APIs directly.
Therefore:
Frontend authorization = user experience
Backend authorization = security
Object-level authorization determines whether a user can access a specific object.
For example:
GET /applications/78291
The backend should determine:
Is application 78291 owned by this customer?
Is application 78291 assigned to this officer or their authorized team?
Does this administrator have permission to access the application?
This is more precise than simply asking whether the user has:
application.read
OWASP’s authorization guidance specifically identifies data-specific authorization as important for preventing BOLA and IDOR vulnerabilities.
Some fields should not be exposed to every role.
For example:
Customer View
Name
Application Status
Loan Amount
Loan officer:
Name
Income
Employment
Credit Information
Documents
Internal Application Data
Admin:
Potentially broader access depending on organizational policy.
The API should avoid returning sensitive fields simply because the underlying database query retrieved them.
Instead, responses can be constructed based on authorization.
For example:
{
“name”: “Customer Name”,
“application_status”: “Under Review”,
“loan_amount”: 500000
}
while internal-only fields remain excluded.
RBAC begins after identity has been established.
The lending platform should therefore implement strong authentication.
Customers may use:
Loan officers and administrators should generally have stronger requirements because their accounts have higher privileges.
For example:
Customer
Password + MFA
Loan Officer
SSO + MFA
Admin
SSO + Strong MFA + privileged access controls
The exact authentication model should be determined by the platform’s threat model and regulatory requirements.
Role changes should affect sessions.
Suppose:
John
Role = Loan Officer
John logs in.
Later:
John
Role = Customer Support
If the existing session still contains the old privileges indefinitely, John may continue performing loan officer operations.
The system should therefore have mechanisms for:
Every sensitive authorization event should be traceable.
Examples:
Customer submitted application
Loan officer opened application
Loan officer downloaded document
Loan officer requested additional information
Admin assigned loan officer
Admin changed loan product
Application status changed
Loan recommendation created
Loan approved
A useful audit event might contain:
actor_id
actor_role
action
resource_type
resource_id
timestamp
IP address
device/session
previous_state
new_state
result
OWASP recommends logging authorization events and creating tests that document and verify authorization rules.
As the platform grows, approval should become a dedicated workflow.
For example:
Application Submitted
↓
Loan Officer Review
↓
Underwriting
↓
Credit Decision
↓
Approval
↓
Loan Agreement
↓
Disbursement
Different users can control different stages.
A customer should never be able to directly transition:
Submitted → Approved
simply by manipulating an API request.
The server should verify the current state and the user’s authority to perform the requested transition.
The platform should prevent users from changing their own access.
For example, a customer should not be able to send:
{
“role”: “admin”
}
to:
PUT /api/users/me
The backend should explicitly exclude security-sensitive fields from customer-controlled updates.
Similarly, a loan officer should not be able to modify:
role
permissions
organization_id
approval_limit
unless explicitly authorized.
Role assignment should be an administrative function.
A controlled workflow could be:
Admin opens user
↓
Selects role
↓
System validates authorization
↓
Role assignment recorded
↓
Audit event created
↓
User permissions updated
For sensitive roles, consider requiring approval.
For example:
Admin requests Loan Officer role
↓
Security/Admin Manager approves
↓
Role activated
Roles must change with the user’s lifecycle.
customer
loan_officer
loan_officer → senior_loan_officer
loan_officer → operations
active → disabled
When an account is disabled, sessions and relevant credentials should be revoked according to the organization’s security requirements.
If the lending platform serves multiple lenders, banks, NBFCs, brokers or financial organizations, authorization becomes more complex.
Consider:
Organization A
|
+– Customer
+– Loan Officer
+– Admin
and:
Organization B
|
+– Customer
+– Loan Officer
+– Admin
A loan officer from Organization A must never automatically access Organization B’s applications.
The authorization model should therefore include:
User
+
Role
+
Organization
+
Resource
+
Relationship
The tenant boundary should be enforced server-side.
A practical lending authorization architecture can look like:
User
|
↓
Authentication
|
↓
API Gateway
|
↓
Authorization Layer
/ | \
RBAC Context Scope
\ | /
↓
Lending Services
/ | \
Customer Application Loan
Service Service Service
|
↓
Database
|
↓
Audit Logs
This structure separates authentication, authorization and business operations.
A lending platform might expose APIs such as:
POST /auth/login
GET /customers/me
POST /applications
GET /applications/{id}
PUT /applications/{id}
POST /applications/{id}/submit
POST /applications/{id}/documents
GET /applications/{id}/documents
POST /applications/{id}/review
POST /applications/{id}/request-documents
POST /applications/{id}/recommend
POST /loans/{id}/repayment
GET /admin/users
POST /admin/users
PUT /admin/users/{id}/role
Each endpoint should have an explicit authorization policy.
For example:
POST /applications
Customer:
YES
Loan Officer:
NO, unless business process allows it
Admin:
YES, if explicitly permitted
And:
POST /applications/{id}/review
Customer:
NO
Loan Officer:
YES, if assigned
Admin:
YES, if permitted
A simplified relational model could look like this:
users
—–
id
name
status
organization_id
roles
—–
id
name
permissions
———–
id
resource
action
user_roles
———-
user_id
role_id
role_permissions
—————-
role_id
permission_id
loan_applications
—————–
id
customer_id
assigned_officer_id
status
loan_amount
created_at
updated_at
loan_documents
————–
id
application_id
document_type
storage_key
status
audit_logs
———-
id
actor_id
action
resource_type
resource_id
timestamp
metadata
The important relationship is:
Customer
↓
Loan Application
↓
Assigned Loan Officer
This allows authorization decisions to incorporate relationships rather than relying only on roles.
A practical implementation can follow this sequence.
Start with:
For example:
Examples:
For example:
application.create
application.read
application.update
application.review
application.submit
application.approve
Customer:
application.create
application.read.own
application.update.own
application.submit.own
Loan Officer:
application.read.assigned
application.update.assigned
application.review.assigned
document.verify.assigned
Admin:
application.read.any
application.update.any
user.manage
role.manage
Check customer ownership and officer assignment.
Control state transitions.
Record sensitive operations.
Attempt access that should fail.
The exact technology stack can vary.
A possible implementation could use:
The architecture matters more than choosing a particular programming language.
RBAC should be tested from the perspective of every role.
Verify that a customer:
Verify that a loan officer:
Verify that administrators:
Avoid:
is_customer
is_loan_officer
is_admin
This becomes difficult to maintain.
Use roles and permissions.
Instead, use assignment or team-based scope.
Never assume hiding a button prevents access.
Use field-level access control where appropriate.
Application state transitions should be controlled by backend business rules.
Break administrative responsibilities into smaller privileges where practical.
Checking only application.read is not enough.
You must also determine which application the user is permitted to read.
Sensitive financial actions need traceability.
Permissions need to change when users change jobs or responsibilities.
Testing only successful workflows leaves authorization vulnerabilities undiscovered.
The cost of implementing customer, loan officer and admin roles depends on the overall lending platform.
A simple lending MVP may require:
A more advanced lending platform may additionally require:
The authorization layer becomes more complex as these capabilities are added.
Therefore, the cost should not be estimated based solely on the number of roles.
A platform with three roles can still have hundreds of permissions.
A typical development roadmap could be:
2 to 4 weeks
2 to 6 weeks
2 to 4 weeks
2 to 5 weeks
4 to 8 weeks
4 to 8 weeks
4 to 8 weeks
4 to 10 weeks
Variable
3 to 6 weeks
These phases can overlap depending on team size and project complexity.
Before launching the lending platform, verify the following.
The simplest way to implement customer, loan officer and admin roles is to start with three clearly defined responsibilities:
Accesses their own financial journey.
They create applications, upload documents, monitor status and manage repayments.
Manages authorized lending workflows.
They review assigned applications, verify information, communicate with customers and perform permitted underwriting operations.
Manages the platform and organizational configuration.
They manage users, roles, products, configuration and operational oversight according to their specific administrative permissions.
But the architecture should not stop at:
Customer
Loan Officer
Admin
A scalable lending platform should evolve toward:
User
↓
Role
↓
Permission
↓
Organization
↓
Resource
↓
Relationship
↓
Context
↓
Business Rule
For example:
A loan officer can review a loan application only when the officer has the appropriate role, the application belongs to the officer’s authorized organization or team, the application is in a reviewable state, and the requested operation is permitted.
That is substantially stronger than simply checking whether:
user.role == “loan_officer”
OWASP recommends explicitly defining users, resources and operations during authorization design, then testing that the resulting permission rules are correctly enforced. It also recommends protecting function-level, data-specific and field-level access.
The most important principle is therefore simple:
Roles define responsibility. Permissions define capability. Resource scope defines what the user can access. Business rules define when the action is allowed.
That combination provides a much stronger foundation for a secure lending platform than a basic three-role implementation.
A basic lending platform can start with Customer, Loan Officer and Admin. As the platform grows, additional roles such as Underwriter, Credit Analyst, Compliance Officer, Collections Officer and Auditor may be introduced.
A customer can typically create and submit loan applications, upload documents, view application status, review loan offers and manage repayments associated with their own account.
A loan officer can typically review assigned applications, verify documents, request additional information, communicate with applicants and perform authorized lending workflow activities.
An admin can manage users, roles, lending products, platform configuration, reports and operational settings, depending on the specific permissions assigned to that administrative role.
Not necessarily. A stronger model limits loan officers to applications assigned to them or their authorized team.
RBAC provides the role-level foundation, but the application also needs object-level authorization. The backend should verify that the requested loan belongs to or is otherwise authorized for the current customer.
The frontend should reflect permissions for usability, but authorization must ultimately be enforced on the backend.
Different employees may need different levels of access to the same customer record. Field-level controls can prevent unnecessary exposure of sensitive financial or personal information.
Usually not. A mature platform should consider more granular administrative roles and least-privilege access rather than giving one account unrestricted access.
Use least privilege, server-side authorization, object-level access checks, deny-by-default behavior and comprehensive audit logging as the foundation. OWASP specifically recommends these practices for application authorization.
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