A valid login does not settle whether a client should copy everything it can reach. Preventing authenticated scraping means controlling both the resources an account may access and the amount or pattern of access the application permits.
Begin with the data boundary. If an account can read another customer's records, fix authorization first. If it can copy its permitted collection far beyond its intended workflow, investigate automated misuse and access policy.
OWASP distinguishes authentication from authorization and recommends validating permissions on each request. A successful login is therefore the beginning of this review, not its conclusion.
Inventory every way an account receives data
List the detail pages, list endpoints, mobile APIs, search results, file downloads, and export jobs available to the same account. Record which backend decides access for each one.
This inventory often changes the proposed fix. A browser challenge on a detail page is irrelevant to an export file served through a separate path. A limit on one API version leaves the question open if another version provides the same collection.
Use a worksheet like this; the rows describe review questions rather than a product configuration.
| Surface | Permission question | Usage question |
|---|---|---|
| Detail response | May this account read this record? | How much new material is returned over time? |
| List response | Are every row and field within scope? | Can pagination enumerate the whole collection? |
| Search | Are result counts and snippets filtered? | Does search expose data missing from detail access? |
| Export job | May this role create this export? | Are concurrent jobs and result size bounded? |
| Integration | Is the credential scoped to its owner? | Is its bulk workload explicitly approved? |
Describe the allowed workflow before judging it
An account used for an approved nightly sync should not be compared with an ordinary interactive session. Document its expected resource scope, cadence, and maximum work. Give it a named owner and an expiry or review date.
For interactive accounts, compare cumulative access with the task the interface supports. A user examining a short list behaves differently from a tool traversing every available result, but the distinction is evidence to investigate. It is not proof that an account belongs to a particular person.
OWASP API6 treats excessive access to legitimate business flows as a security problem in its own right. Authentication can be working correctly while that problem exists.
Put limits next to the data decision
An application can make useful distinctions that a global IP rule cannot. It knows which account requested the material, which permission was checked, and whether the response contains one record or a large export.
Consider independent budgets for an account, a resource family, and expensive bulk operations. Choose their values from legitimate usage and service capacity. Do not infer a safe threshold from a generic requests-per-second example.
Keep authorization mandatory even when the automation assessment is favorable. Conversely, passing authorization should not automatically waive an approved usage allowance.
Handle a suspicious account carefully
Preserve a redacted request timeline before changing policy. Separate evidence of extraction from evidence of account compromise. Automated activity under an account does not establish stolen credentials; an owner may have written a script or shared a permitted integration.
If compromise is suspected, the account-takeover prevention guide covers the separate authentication and recovery response. If the issue is excessive extraction, start with a bounded restriction on the affected data path and a clear support route.
Recheck mobile clients, normal pagination, and sanctioned integrations after the change. Your completion criterion is that the protected collection follows its intended access policy while approved work remains possible.
Review the scraping and crawler use case against the resource inventory. Identify which component can stop each response before the data leaves it.