A feature flag can control whether a feature is shown or rolled out; it cannot prove that a user is allowed to use it. Enforce authorization at a trusted layer for every protected operation, even when the interface hides the feature or a rollout flag is off.
What feature flags control—and what authorization decides
A feature flag is a configuration mechanism for controlling feature exposure, rollout, or code paths. It can help release functionality gradually or turn a feature on and off. Authorization is a separate security decision: may this particular subject perform this operation on this resource?
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That distinction matters because a flag can affect what a user sees without protecting the underlying operation. Hiding a button, menu item, or page is presentation control. A user may still call an API directly, alter client-side state, or reach the same operation through another route. The operation must independently check permission.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsOWASP’s feature-flag security testing guidance treats bypassing a flag as a security test concern. OWASP ASVS 5.0, control 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: V8 Authorization
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Where the authorization check belongs
Put the decision at a trusted enforcement point that the requester cannot bypass or change—typically server-side application or service logic. Apply it when the protected operation is requested, not only when the interface is rendered or a flag is evaluated.
Authorization rules should reflect the function and data being protected, the subject’s permissions, and relevant resource attributes. Depending on the system, policy decisions may also consider the requested operation, subject attributes, relationships, or environmental context. NIST describes these inputs in SP 800-205, Attribute Considerations for Access Control Systems, published June 18, 2019.
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Authentication and authorization are related but distinct: establishing who a user is does not establish what that user may do. OWASP’s C1: Implement Access Control emphasizes applying aligned access control across the paths that can reach an operation. The OWASP Developer Guide access-control checklist recommends checking every request unless it is public.
How to test a flag-gated feature
- Inventory security-relevant flags and configuration. Include settings that affect authentication, MFA, authorization, fraud controls, rate limiting, account recovery, administrative functions, or security monitoring. Finding a flag is an inventory step, not proof that it enforces access control.
- Locate the operation behind each flag. Identify the API endpoint, service call, message handler, or other execution path that performs the protected action.
- Attempt the operation as an unauthorized identity. Test the underlying endpoint or path directly, including when the feature is hidden or its rollout flag is disabled. The expected result is continued denial; OWASP gives HTTP 401 or 403 as example denials.
- Manipulate client-visible state. Change a client-side flag or otherwise expose the interface, then repeat the operation. A visible control must not grant access; the trusted authorization check should still deny a subject without permission.
- Compare rollout states and access paths. Test flag-on and flag-off behavior, and check relevant routes, services, instances, and layers. Where possible, combine black-box testing of responses with gray-box inspection of flag evaluation and configuration visibility.
- Test transitions and outages. Check whether services agree on flag state, whether rollback leaves code and security configuration compatible, and what happens if the flag service is unavailable. Define fail-safe behavior rather than relying on an undocumented default.
Failure modes to design against
- Client-side bypass: A user changes browser state or calls the endpoint directly, bypassing a hidden control.
- Inconsistent state: Different services or instances evaluate a flag differently, creating an unintended path to the operation.
- Rollback mismatch: A code rollback restores behavior that expects security configuration no longer present, or the reverse.
- Exposed targeting configuration: Client-visible configuration reveals more targeting information than the current user or context needs.
- Stale gated code: A temporary flag and its conditional paths remain after rollout, preserving confusing or weakly tested behavior.
- Unclear outage defaults: If the flag service fails, an implicit default may expose a feature or disrupt an authorization flow. Document the intended fail-safe behavior.
Keep feature configuration coordinated with application releases, limit client exposure to configuration needed for the current user and context, and remove stale flags and gated paths once they are no longer needed. These practices reduce rollout risk, but they do not replace authorization checks.
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A practical design test
For each protected action, ask two separate questions:
- Exposure: Should this feature be presented or enabled for this rollout, audience, or environment?
- Permission: Is this subject allowed to perform this operation on this resource right now?
A flag may answer the first question. A trusted authorization policy must answer the second on every relevant access path. Evaluate the implementation by where that decision is enforced, whether all paths reach it, how it responds to client manipulation, and how it behaves during rollout, rollback, and service outages.
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