Design roles around real activities
Map what customers, administrators, staff and partner users need to read or change. Review whether users should see company-wide information or only records assigned to them. Server-side authorization is essential; hiding a menu item does not prevent a user from accessing an endpoint directly.
Protect identity and sessions
Choose a tested identity provider where appropriate, require secure account recovery, and enforce sensible session expiration. Add stronger authentication for sensitive actions and review how invited users are verified. Include rate limiting and monitoring for suspicious login attempts.
Treat files as sensitive data
Portals often contain contracts, invoices, statements and identity documents. Use private storage, expiring signed download links where appropriate and strict file validation. Scan uploads where relevant and restrict access to each organization's records. Avoid leaking filenames or metadata in public URLs.
Test the real permission boundaries
Build tests that deliberately attempt cross-tenant access, direct object references and privilege escalation. Document incident handling, backups and access revocation. The result should be a product that customers can trust, not just a login screen wrapped around an internal application.
Define a permission matrix before the interface
List each role—customer user, account administrator, internal support and platform operator—and the actions each may perform on every record type. Include read, create, edit, approve, export and delete separately. The interface can hide controls, but the server must independently enforce authorization for every request. Test attempts to open another customer’s invoice or download an attachment by changing its ID; broken object-level authorization is a documented API risk.
- Who can see or export billing and personal details?
- Can users invite others or change roles?
- Which support actions require a recorded reason?
- How are access rights removed when accounts close?
Protect identity, files and audit records
Use mature authentication controls, secure session handling and appropriate additional verification for high-risk actions. Uploaded files require type and size validation, safe storage, access checks and malware-handling decisions. Store secrets outside application code and avoid recording passwords, tokens or unnecessary personal details in logs. Define retention and deletion expectations with the business owner and applicable privacy obligations.
Include abuse and recovery testing
Rate-limit sensitive endpoints, detect repeated authorization failures and exercise password-reset and account-recovery flows. Test multiple organizations with similarly structured identifiers to expose cross-tenant errors. Review how administrators reverse mistakes without editing database records manually. Document a security escalation contact and an incident response procedure. Passing one automated scanner is not a substitute for role-based manual security testing.