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Hiding a button or protecting a route in the frontend does not stop someone from calling the underlying API. Those controls shape what a user sees; they do not establish permission. The backend must authorize every protected request using trusted identity and server-side rules, and return only data the caller is allowed to receive.
What authorization means—and what it does not
Authentication establishes who is making a request. Authorization decides whether that identity may perform a particular action on a particular resource. Signing in does not automatically grant access to every feature, account, or record.
A frontend can hide a control from users who should not use a feature, but the browser is controlled by the user. They can change client-side logic, alter route behavior, or send a request without using the screen at all. A role check in JavaScript is therefore not a security boundary.
Why frontend visibility checks fail as security controls
Hidden buttons can still have callable operations
Removing a button from the page does not remove the API endpoint it would have called. A user may construct a direct request or modify browser behavior. If the server does not check permission, the hidden control offers no protection.
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Client-side route guards only control navigation
A route guard can redirect a user away from a page in the application, but it cannot prevent a direct request to the server. Treat it as navigation and usability logic, not enforcement.
Frontend filtering can expose data
If the backend sends a privileged response and the frontend merely hides unauthorized records or fields, the data has already reached the caller. Apply access rules before returning the response; send only records and fields the requester is entitled to see.
Feature flags and client-supplied roles are not trusted policy
Client-side flags and role or tenant values supplied by the browser can be changed. Use trusted identity information and server-side policy data to decide access, rather than treating a value in the request or client state as proof of permission.
What the backend must enforce
Authorization belongs at a trusted service layer or equivalent backend boundary. OWASP ASVS 5.0 requirement 8.3.1 states: “Verify that the application enforces authorization rules at a trusted service layer and doesn’t rely on controls that an untrusted consumer could manipulate, such as client-side JavaScript.” OWASP ASVS 5.0
For each protected request, the server should make a fresh decision based on the caller, requested operation, and target resource. Include the tenant or account boundary when relevant. Do not infer permission because a request came from a particular screen, route, AJAX call, micro-frontend, or client application.
- Default deny: Requests should not receive access unless an applicable policy grants it.
- Least privilege: Grant only the actions and data needed for the user’s role or task.
- Resource-specific checks: Confirm permission for the particular record or object, not merely access to a general feature.
- Minimal responses: Return only authorized records and fields.
- Consistent enforcement: Apply the same server-side rules regardless of which client or interface initiated the request.
OWASP’s authorization guidance emphasizes checking permissions on every request. OWASP Authorization Cheat Sheet
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Keep frontend checks for a better user experience
Frontend checks are still useful when their purpose is clear. They can hide unavailable actions, avoid inviting users into a workflow they cannot complete, and explain why an option is unavailable. They can also reduce unnecessary requests. But the server’s authorization result remains authoritative: if a request reaches a protected operation, the backend must check it.
This distinction matters in micro-frontends too. Separate teams, repositories, or deployments do not create separate security boundaries inside a user’s browser. Any component that requests a privileged operation still depends on server-side authorization.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to test for authorization bypass
Tests should verify the server’s decision, not just whether the interface displays a control. Document function-level and data-specific rules, then exercise them through backend and integration tests. OWASP’s Developer Guide provides supporting application-security guidance. OWASP Developer Guide
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- Identify protected operations and resources. Record which identities may perform each action and which records or tenants the policy covers.
- Test permitted requests. Confirm that an authorized identity can perform the intended operation and receives the appropriate data.
- Test direct requests. Call the endpoint without using the relevant screen or route. An unauthorized caller should not gain access simply by bypassing the interface.
- Test identity and resource boundaries. Try the same operation with an unauthorized identity and against a resource or tenant the caller does not control.
- Inspect response data. Verify that restricted records and fields are absent from the server response, not merely hidden after delivery.
- Check failure handling and logs. Ensure denied requests do not disclose protected information and that relevant authorization events are recorded.
OWASP Cornucopia and the OWASP Cheat Sheet Series offer further security guidance for identifying and applying authorization rules. OWASP Cornucopia and OWASP Cheat Sheet Series
A practical decision rule
For any action or data that must be restricted, ask: would the server still deny access if the user changed the frontend, skipped the route, or sent the request directly? If the answer depends on the browser behaving honestly, authorization is not being enforced at the right boundary.
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