1 / 3
Map callers, resources, and actions
Read who may act on which resources through detail, list, and export routes.
Evidence to retain
Authorization conditions mapped to existing tests.
Keep user and organization data separated
Connect resource authorization with the boundaries controlling reuse of generated responses.
When to use this guide
Use this when APIs and shared caches handle user- or organization-specific data.
Review whether identity separation is preserved both when retrieving data and when reusing responses.
Where to start
2 / 3
Read response sharing rules
Compare Cache-Control, CDN settings, and key variation on identity-dependent routes.
Evidence to retain
The rationale for shared responses and identity-separated responses.
3 / 3
Record the tested boundaries
Review existing allow, deny, and cross-user isolation tests, identifying untested routes and conditions.
Evidence to retain
Test scope by identity, organization, route, and cache state.
Apply the rules to your environment
Inspect query authorization and retrieval limits →
An API exposes user or organization data through detail, list, and export endpoints.
Read how each endpoint checks the caller against the requested resource.
Keep personalized responses isolated in caches →
A CDN or application cache handles responses that vary by user.
Review the relationship between the response, shared-cache policy, and cache key.
Read the source incidents
2りんかんイエローハット: unauthorized access and impact →
The application API was abused to retrieve membership data; the specific authorization defect or vulnerability is undisclosed. Membership information for 3,179,454 people was leaked, revised from a maximum of 3,455,754. Separately managed payment data was excluded.
チケットプラス: data exposure and authorization boundaries →
A cache change intended to reduce load caused cross-user information display during concurrent access. Up to 107 data owners and 322 viewers are separate scopes. Their sum is not a confirmed leaked-person count.
Selected examples. Each record retains its evidence status, unknowns, and sources.
Connect terms to review questions
- Tenant boundary
- The separation between organizations sharing an application. Review whether data and permissions can cross that separation.
- Is the organization boundary checked for lists, detail views, and exports?
- Open the related inspection rule →
- Cache
- Storage and reuse of responses. Define who may share them and the conditions under which they can be reused.
- Can a response tied to one user be reused for someone else?
- Open the related inspection rule →
Keep conclusions within the evidence
- Login requirements and hard-to-guess identifiers do not replace resource authorization.
- Private and no-store have different meanings; a setting name cannot establish coverage of every route.
Correct retrieval authorization still needs a separate review of response reuse.
References and review dates
- OWASP: Authorization Cheat Sheet ↗
Enforce Least Privileges; Validate the Permissions on Every Request
- IETF / RFC Editor: RFC 9111: HTTP Caching ↗
3.5; 5.2.2.5 no-store; 5.2.2.7 private
Learning review 2026-11-12 · Catalog review 2026-11-09
Give this scope to your AI
Share these two rules and examples without expanding the scope. Checks without evidence remain unverified.
Open this inspection pack →Explore another scenario
Check what was actually deployed
Connect the running version with the external code executed on its way to deployment.
Follow login and the session after it
Review MFA coverage separately from the mechanisms that stop an authenticated session.
Review secret handling without opening values
Map exposure paths and the process for invalidating old credentials after replacement.
Review exposure and data that remains
Review storage exposure together with the handling of retired environments and data copies.
Trace input into queries and file processing
Follow inputs from entry points to SQL construction and file storage or processing.
Separate the blast radius from recovery
Connect reachable resources with containment and restoration records.
Set AI boundaries before delegating a task
Review destinations, action authorization, and traceable records at the execution boundary.