Direct answer
A download link is an access path to data. Verify that the authenticated caller or narrowly scoped temporary link is authorized for the specific file, not merely for the page that generated it.
Prepare owned fixtures
Create two test accounts with separate synthetic reports and document who may download each file. Include any legitimate shared report and record whether links are direct application routes or temporary storage URLs.
Reference: OWASP Authorization Cheat Sheet.
Compare access paths
Download A's file as A, then use B's session to request the same controlled file route. Check the returned content, not only a status code. Also test an unauthenticated request where it is safe and within scope.
- Use files containing no real customer information.
- Record link expiry and sharing policy when relevant.
- Avoid putting live signed URLs into tickets.
Review temporary links
A pre-signed URL can act as a bearer credential until its expiration or applicable revocation conditions. Check its scope, lifetime and logging exposure against the workflow. Do not assume that signing the URL independently proves the recipient was authorized to obtain it.
Verify the fix
After changes, retest allowed, denied and expired cases and ensure the authorized user can still retrieve the correct file. Review exports, thumbnail routes and background delivery if they share the same object.
Assessment limits
Temporary URL behavior depends on the storage provider and access policy. A single generated file does not establish protection of all attachments, exports or caches.
Frequently asked questions
Is an unguessable download URL authorization?
It can act as a bearer secret but does not replace an appropriate issuance policy, limited lifetime and careful handling.
Does blocking the page protect the underlying file?
Not necessarily. Test the actual file delivery route and storage policy separately.
Primary sources and further reading
These guides combine published security guidance with practical assessment planning. Adapt checks to the owner's policy, environment, and authorized scope.
This guide was prepared with AI assistance using the linked sources and illustrative examples. Check current vendor guidance and your environment before making changes.