Security Testing for Agencies Shipping Client Apps

Agencies build websites, apps and platforms for clients who trust them to get it right. When a client's app is breached, the agency's reputation is on the line too, and sometimes its contracts. Security testing before handover protects both sides.

Why agencies are exposed

• Many projects, many stacks. Each client project may use a different framework, CMS or hosting setup.
• Tight deadlines. Security review is often the first thing cut.
• Handover gaps. After launch, nobody may own updates and monitoring.
• Shared credentials and access across projects and team members.
• Client expectations. Clients increasingly expect a security sign-off, especially larger ones with their own vendor requirements.

What to test before every launch

1. Authentication and access control: can users access each other's data or admin functions?
2. Input handling: injection and XSS in forms, search and APIs.
3. File uploads: safe storage and serving.
4. Exposed files: no .env, .git, backups or debug endpoints on production.
5. Configuration: HTTPS, security headers, error handling and debug modes off.
6. Dependencies and CMS plugins: up to date, no known vulnerabilities.
7. Secrets: no API keys in frontend code or repositories.
8. Cloud and hosting: no public storage or exposed databases.
9. Staging environments: protected or removed.
10. DNS and email: no dangling records, SPF, DKIM and DMARC set.

Build security into the agency workflow

• Starter templates with secure defaults: authentication, authorisation helpers, headers and validation.
• A pre-launch security checklist signed off for every project.
• Automated testing as part of the launch process, producing a report.
• Separate credentials per client, stored in a password manager, with MFA.
• Clear handover: who owns updates and monitoring after launch, written into the contract.

Turn security into a service

Security reports are valuable deliverables:

• Include a pre-launch security report in project fees as a mark of quality.
• Offer ongoing security testing as part of maintenance retainers.
• Help clients with security questionnaires from their own customers, using your reports as evidence.

This converts a cost into recurring revenue and differentiates your agency.

Contracts and liability

Work with legal counsel to clarify security responsibilities in contracts: what the agency tests before launch, what the client is responsible for after handover, and how vulnerabilities found later are handled.

Testing at agency scale

Agencies need testing that works across many projects and stacks without scoping calls for each. SecurityInfinity lets you add a client app, run AI pentesting agents across web, API and infrastructure, and export a report with verified findings and fixes, typically within minutes. Start free or book a demo to discuss agency use.

Frequently asked questions

Should agencies test client apps without permission?

Only test systems you are authorised to test. Include security testing in your statement of work so authorisation is explicit.

Who pays for fixing vulnerabilities found after launch?

That depends on your contract. Define warranty periods and maintenance responsibilities clearly in advance.

Can we white-label security reports?

Many agencies present security testing as part of their own delivery. Check the terms of the testing platform you use.