SaaS Penetration Testing

Your enterprise prospects want a pentest report. Here's how to get one.

Fixed-price penetration testing built for SaaS companies - web application, API, authentication, and multi-tenancy testing, delivered by UK-based consultants who understand how SaaS is built.
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Accreditations and memberships

CREST member company, accredited for penetration testing CREST-accredited penetration testing Cyber Essentials certified UK Cyber Security Council member

Why SaaS Companies Come to Us

Four moments that send SaaS teams to a pentest

A penetration test is rarely a proactive decision for a SaaS company. It's usually triggered by one of these four events. Whichever one you're facing, we've scoped engagements for it before.

An enterprise prospect asked for a pentest report before signing

Security questionnaires and vendor diligence processes now routinely request evidence of third-party penetration testing. An attestation or full penetration test report from an accredited provider unblocks the deal.

SOC 2 or ISO 27001 audit recommends evidence of testing

Penetration testing is recommended as part of SOC 2 Type II and ISO 27001 certification. We scope and report against your specific framework requirements.

Investors or a board want assurance before funding or exit

Security due diligence is now standard in Series A+ rounds and M&A processes. A pentest report from a credible provider reduces risk flags and demonstrates that your team takes security seriously.

You're moving upmarket and need to close enterprise deals

As you move from SMB to enterprise customers, expect more scrutiny of your security posture. A penetration test report is a tangible way to demonstrate that your SaaS is secure and ready for enterprise adoption.

Scope of Testing

What a SaaS penetration test covers

SaaS applications are heavily API-driven, multi-tenant by design, and often tightly integrated with third-party services. Our testing methodology is built around how your SaaS is actually built - not a generic web application checklist.
01

Web Application Testing

Manual testing of your application across all authenticated user roles against OWASP Top 10 and beyond. Business logic flaws, privilege escalation, insecure direct object references, and session management issues that automated scanners miss.
02

API Penetration Testing

Testing of REST and GraphQL APIs for authentication weaknesses, broken object-level authorisation (BOLA), mass assignment, rate limiting, data over-exposure, and injection vulnerabilities. Coverage includes undocumented endpoints and internal APIs exposed via the frontend.
03

Authentication and Authorisation

Deep testing of login flows, password reset mechanisms, MFA implementation, OAuth and SSO integrations, JWT handling, and session token entropy. Particular attention to role-based access control gaps: can a standard user reach admin functionality?
04

Multi-tenancy and Data Isolation

Testing whether one tenant can access, modify, or infer data belonging to another. This is the highest-severity risk class for SaaS platforms, where a data isolation failure can be business-ending. We test horizontal privilege escalation paths across your tenancy model.
05

Third-party Integrations and Webhooks

Testing of OAuth integrations with third-party services (Stripe, Slack, HubSpot etc.), webhook implementations, and any inbound API traffic. Integration points are frequently overlooked in standard assessments but represent real attack surface in production SaaS.
06

Infrastructure and Cloud Exposure

Review of externally exposed infrastructure - S3 buckets, storage endpoints, admin panels, staging environments, and exposed services. Particularly relevant for SaaS platforms hosted on AWS, GCP, or Azure. Can be scoped as an optional add-on to the application assessment.

How It Works

From first contact to final report

We keep the process as low-friction as possible. You don't need to have a scope document prepared before reaching out.
01

Tell us what you need

Submit a quote request or book a scoping call. Give us a rough idea of your application, API, number of user roles, and any compliance context. We'll ask questions if needed.

Response within 1 business day. There's no obligation at this stage - we'll take the time to understand your environment and requirements before putting a proposal together.

02

Receive a written, fixed-price proposal

We'll send a written proposal confirming the scope, methodology, timing, and a fixed price. No day-rates, no surprises. You accept when you're ready.

Your fixed price is confirmed before testing begins. The proposal also documents the rules of engagement and confirms our methodology, so your team and ours are aligned before a single test is run.

03

Testing begins - with direct access to your consultant

Your assigned consultant begins testing at the agreed time. You'll have direct contact throughout, where critical findings are communicated immediately - not held until the final report.

Typically 4-6 days of active testing for an average SaaS scope. No account managers in the middle - the person testing your platform is the person you speak to. Critical findings are escalated to you the same day they're discovered.

04

Report delivery and debrief

Your technical and executive reports are delivered within 2 business days of testing completion. A debrief call covers findings, remediation priorities, and answers questions from your team. You'll also receive an attestation of testing for sharing with enterprise prospects or auditors.

Report delivered within 2 business days. Once you've remediated identified vulnerabilities, focused retesting is included at no extra cost - confirming the fixes hold before your report is shared externally.

What You Receive

Everything included in the engagement

Every SaaS penetration test from Exploitr includes the following as standard - there are no add-on fees for standard deliverables.

  • Executive Report

    Our primary deliverable is an executive-focused assessment report providing a non-technical summary of findings, with recommendations suitable for board, senior management, and enterprise procurement stakeholders.

  • Technical Report

    A supplementary technical report detailing each vulnerability discovered during the engagement - including reproduction steps, severity scoring, remediation guidance, and mappings to CVE, CVSS, and MITRE ATT&CK where applicable.

  • Debrief Session

    Every engagement includes the offer of a debrief session to present findings, discuss remediation priorities, and run an open Q&A with your technical and business teams.

  • Retesting

    For externally-based assessments, our team offers free focused retesting of any vulnerabilities remediated post-engagement, including web application, API, website, and external network penetration testing.

  • Exploitr Platform Access

    Access to the Exploitr platform at no extra cost, to review, track and remediate findings during the engagement and between tests.

  • Experienced, Consultant-led Testing

    All engagements are consultant-led by in-house staff. Your consultant works with you from initial scoping through to the debrief and remediation phase - nothing is outsourced or subcontracted.

Common Questions

SaaS pentesting - frequently asked questions

Everything you need to know about how SaaS penetration testing is priced, scoped, and delivered before you request a quote.

A mid-sized SaaS application with multiple user roles, authentication and complex business logic typically costs between £6,000 and £10,500+. The final price depends on the number of user roles, the complexity of workflows and whether a separate API needs testing.

Our penetration testing pricing guide compares costs across every service.

We prefer to test against a staging environment where possible, especially for SaaS platforms with active customers. If a production test is required, we agree rules of engagement in advance that define any excluded functionality and operational constraints.

Critical findings that could affect production are escalated to you immediately, not held until the report.

Before testing begins, we'll need:

  • Test accounts for each user role to be tested (admin, standard user, etc.)
  • Access to a staging or test environment, or written permission to test production
  • API documentation if available (Swagger/OpenAPI, Postman, or equivalent)
  • A list of any systems or functionality that should be excluded from testing
  • An emergency contact in case of a critical finding or connectivity issue during testing

We discuss all of this during the scoping call and confirm it in the written proposal before any testing takes place.

Yes. Our reports are written with the understanding that they may be shared with third parties such as enterprise procurement teams, auditors, investors, and board members.

The executive report is designed for non-technical stakeholders, and the technical report satisfies evidence requirements for SOC 2 Type II, ISO 27001 Annex A, and most enterprise security questionnaire responses.

We can also provide a letter of attestation on request.

From initial contact to report delivery, a typical SaaS engagement runs as follows:

  • 1-2 days to scope and quote
  • 2-3 weeks scheduling lead time
  • 4-6 days active testing
  • 2 business days to deliver the report

If you have a compliance deadline or a deal closing, let us know upfront and we'll work to your timeline where possible.

Yes, the application-layer testing we conduct is cloud-agnostic.

If you'd like us to include a review of your cloud infrastructure configuration (exposed storage, overly permissive IAM, exposed admin interfaces), this can be added to the scope as an external infrastructure component. We'd discuss this during scoping and confirm it in the written proposal.

Most frameworks (SOC 2, ISO 27001, PCI DSS) recommend or require annual penetration testing at minimum.

For fast-moving SaaS products with frequent releases, we'd suggest testing after any significant architectural change, such as a new authentication provider, a major API version, or a new product area in addition to the annual assessment.

Our Pentest as a Service (PTaaS) offering is designed specifically for teams that need ongoing testing coverage aligned with their release cadence.

Ready to scope your SaaS penetration test?

Tell us about your application and we'll get back to you with a fixed-price proposal within one business day. No obligation at any stage.
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