Topic starter
24/06/2026 9:14 pm
TL;DR: Authentication verifies who a user or process is, while authorization determines what that identity can do, according to Cerbos. The distinction matters because weak identity verification or coarse permissioning can each leave sensitive application resources exposed, even when both controls are present.
Editorial analysis by NHI Mgmt Group, based on content published by Cerbos: “Authentication vs Authorization”.
Key questions
Q: What breaks when authentication and authorization are treated as the same control?
A: Teams lose visibility into whether the real problem is identity proof or permission scope.
Q: When should teams prioritise authorization design over stronger login controls?
A: Prioritise authorization design when the main risk is excessive access after a valid login.
Q: What are the signs that application authorization is too coarse?
A: Common signs include broad admin-like roles, heavy use of exceptions, permission logic embedded in multiple services, and users seeing resources that do not match their job or context.
Practitioner guidance
- Separate identity proofing from access policy Document authentication as the identity verification step and authorization as the request decision step.
- Adopt policy-based authorization for sensitive resources Use RBAC where role boundaries are stable, but introduce ABAC or similar policy logic when access depends on resource sensitivity, tenant, environment, or time.
- Review applications for privilege creep after authentication Look for systems where a successful login unlocks more than the user or process actually needs.
Bottom line: Authentication and authorization solve different problems, and application security weakens when teams expect one to compensate for the other.
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25/06/2026 6:20 am
Authentication and authorization are separate control planes, and mixing them is still one of the most common application security failures. Authentication establishes a trusted identity claim. Authorization constrains what that trusted identity can do. When teams collapse those layers, they lose the ability to enforce least privilege at the point where it matters most: resource access.
A few things that frame the scale:
- 43% of security professionals are concerned about AI systems learning and reproducing sensitive information patterns from codebases, according to the State of Secrets in AppSec.
A question worth separating out:
Q: How should teams choose between RBAC and ABAC for application authorization?
A: Use RBAC when access maps cleanly to business roles and the number of exceptions is low. Use ABAC when decisions depend on context such as device, location, resource sensitivity, or time. Most teams need both: RBAC for baseline access and ABAC for exceptions that would otherwise create role sprawl.
👉 Read our full editorial: Authentication vs authorization in modern application security