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Protect a master template as both a confidential object and a high-impact control plane. For every request, authenticate the caller, verify the tenant and exact template, authorize the requested action, and separately authorize sensitive fields such as ownership, publication state, and sharing. An ID, role name, API key, or hidden UI button is not permission.
Start with an explicit resource-and-action policy
Write the policy before implementing endpoints. Treat a master template as a resource with distinct actions, not as a blob that anyone who can edit designs may modify.
| Action | Typical authorization question | Controls to consider |
|---|---|---|
| Read, preview, export | May this principal view this exact template and its assets? | Object and tenant checks; field-level response filtering; no-store caching for sensitive browser responses |
| Update content | May this principal change ordinary design elements? | Allowlisted fields; version or concurrency check; audit event |
| Duplicate or clone | May the caller create a derivative, and where may it be created? | Authorize source read and destination creation separately; enforce destination tenant |
| Publish | May this role make the master available to downstream users? | Separate publish permission; approval or review workflow where appropriate |
| Share or change ownership | May the caller expand access or move the resource? | Administrative permission, explicit target validation, immediate audit and notification |
| Archive or delete | May the caller make the source unavailable or destroy it? | Restricted role, retention rules, recovery path, reauthorization at execution time |
Use deny-by-default rules and grant the minimum action each role needs. Keep cross-tenant administration separate from ordinary editing; an administrator who can operate across tenants should have an explicit scope, not an accidental bypass.
How do I stop users from editing the master template?
Separate editability from master status
Do not rely on a client-supplied is_master flag or a disabled button. Store master/source status server-side and enforce it on every mutation route. A user may be allowed to edit a personal copy while being denied updates to the master. If the workflow permits approved master edits, create a dedicated action such as submit_master_change and let a separately authorized role approve or publish it.
#1 Best Overall
Use an update allowlist
Parse the request with a schema that names fields the caller may change. Reject, rather than silently accept, server-controlled properties including tenant or owner ID, publication status, sharing permissions, source/master status, and audit metadata. This prevents mass assignment, where a caller adds a privileged property to an otherwise legitimate update.
PATCH /v1/templates/tpl_123
Authorization: Bearer <access-token>
Content-Type: application/json
{
"title": "Approved campaign layout",
"content": { "layers": [/* ordinary editable content */] },
"version": 17
}The server should ignore no unexpected field silently: return a validation error for a protected property, then record the denied attempt. Check the supplied version (or equivalent concurrency token) so an old editor cannot overwrite a newer approved master.
How do I keep one customer from accessing another customer’s templates?
Derive tenant context; never trust a tenant parameter
Authenticate the principal, resolve its current membership, and derive the tenant set and scopes on the server. A tenant_id in a URL or JSON body is only a selector to validate. Complex or opaque template IDs do not replace this check.
Apply the verified context end to end:
- Database: every query includes the authorized tenant boundary. Row-level security or another database isolation boundary is useful defense in depth.
- Cache: classify entries as global, tenant-scoped, or user-scoped. Include tenant identity and other authorization-varying attributes in keys, and authorize before reading a protected value.
- Object storage: place assets in an enforceable tenant-aware partition. Authorize the exact object before returning it or issuing a signed URL; keep URL scope and lifetime aligned with revocation.
- Queues and jobs: carry verified tenant, subject, and scopes in authenticated job data. Reauthorize the operation when the worker executes it, because membership may have changed.
- Logs and exports: apply the same boundary to previews, bulk export, search, clone, and download paths, not only the detail endpoint.
Example authorization flow
- Validate the token’s integrity, trusted issuer, intended audience, and validity time.
- Load current membership and permitted scopes for the subject.
- Fetch the template by ID within that tenant boundary.
- Evaluate the requested action against the template’s state and the caller’s role.
- Filter response fields and issue only an appropriately scoped asset URL.
- Write an audit event containing subject, tenant, object, action, decision, and correlation ID.
Do not fetch by ID first and check ownership later if the initial query, cache, or error path can reveal whether a foreign object exists. Return a consistent not-found or forbidden response according to your disclosure policy, without exposing internal identifiers.
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HTTPS protects the transport; it does not decide whether a caller may publish a master. Enforce authentication and authorization at each endpoint and resource boundary. Permit only intended HTTP methods, and authorize collection, action, and record routes independently. API keys alone are not a sufficient safeguard for sensitive or high-value resources: bind service credentials to explicit tenants, environments, and scopes, rate-limit them, rotate and revoke them, and keep them out of URLs.
For browser-facing sensitive responses, use an appropriate Cache-Control: no-store policy. Choose error codes and messages that help legitimate clients without leaking tenant existence, storage paths, or policy internals.
Protect every path, not just the obvious endpoint
List the complete operation surface in your API contract: list, detail, preview, export, update, duplicate, publish, archive, delete, share, ownership transfer, asset download, asynchronous job creation, and webhook delivery. For each operation document:
- authentication scheme and required scopes;
- tenant and object conditions;
- allowed and protected request fields;
- state transitions and concurrency requirements;
- audit events and expected denial behavior.
When a template is intentionally shared, specify the exact scope: individual user, project, tenant, or public link; whether cloning is allowed; and when access expires. Test the rule on every route that can reach the shared object.
Rank #3
How should template permissions be tested?
Build a negative authorization matrix
Create at least two tenants, two users per tenant, an editor, a publisher, and an administrator. Seed a master and derivative in each tenant. Assert both permitted and denied outcomes:
| Test | Expected result |
|---|---|
| Tenant A reads Tenant B template by a valid ID | Denied; no foreign record, asset URL, or revealing identifier |
| Editor calls publish, share, ownership, or delete | Denied even when ordinary content edits are allowed |
| Caller submits protected fields in a content update | Validation or authorization failure; fields remain unchanged |
| Expired, malformed, wrong-audience, or under-scoped token | Denied before protected data is returned |
| Clone into another tenant | Denied unless explicit cross-tenant administration permits both source and destination |
| Queued job runs after membership revocation | Worker rechecks and refuses the operation |
| Cache is warmed by one tenant and read by another | No cross-tenant value or metadata is returned |
| Allowed same-tenant edit and approved publish | Succeeds and creates the expected audit events |
Run tests in the regression pipeline
Declare security requirements globally and per operation in OpenAPI or an equivalent contract, then generate or hand-write negative tests from that declaration. Add tests when middleware, routing, caching, storage, or worker code changes; a refactor that bypasses a shared authorization layer must fail CI. Monitor denied-action rates and alert on unusual cross-tenant probes without treating logs as a substitute for enforcement.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose an enforcement architecture deliberately
Central policy middleware improves consistency, while resource-specific checks are still needed for state and field rules. Compare alternatives on the strength of the tenant boundary, coverage of every read/write/clone/publish path, field and action granularity, operational and performance cost, auditability, regression-test ease, and revocation or cache-invalidation behavior. NIST SP 800-228 Update 1 (updated March 13, 2026) frames API protection as risk analysis with incremental, risk-based pre-runtime and runtime controls; use stronger isolation and review for templates whose compromise would affect many downstream designs.
OWASP lists broken object-level, object-property-level, authentication, and function-level authorization as distinct API risks. Its API1:2019 guidance states: “Every API endpoint that receives an ID of an object, and performs any type of action on the object, should implement object level authorization checks.” OWASP’s 2021 Top 10 ranked Broken Access Control as the most concerning web vulnerability, a broad ranking rather than a measured rate of master-template incidents. No published source establishes a design-API-specific incident rate or effectiveness statistic, so use these frameworks to structure controls, not to claim a template breach probability.
Rank #4
Operational checklist
- Object and action checks run on every endpoint that accepts a template identifier.
- Tenant context comes from verified identity and current membership.
- Protected fields use explicit allowlists and separate permissions.
- Cache, storage, exports, webhooks, and workers preserve tenant context.
- Tokens are validated for issuer, audience, time, integrity, and scope.
- Keys are rate-limited, rotated, revocable, and absent from URLs.
- Audit records capture both successful and denied sensitive actions.
- Cross-tenant, stale-token, field-tampering, and regression tests run continuously.
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Frequently Asked Questions
Should a master template ever be directly editable?
Only when a documented workflow grants that action to a specifically authorized role; otherwise require edits to a derivative or a reviewed change request.
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No. Identifiers select objects; object-level authorization must still verify the caller, tenant, and requested action.
What should be logged for a denied request?
Record the authenticated subject, tenant, object, action, decision, timestamp, and correlation ID while avoiding sensitive content and policy internals.
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