at one point in the sales cycle for any SaaS product that founders and sales teams learn to dread: when the enterprise prospect sends over a security due diligence questionnaire. The document has dozens of lines. It asks about architecture, access policies, incident history, and regulatory compliance. And it almost always includes a direct question about SaaS penetration testing: when the last test was conducted, who performed it, and whether a report is available. In this article, you will understand why large customers and investors have started requiring penetration testing as a qualification criterion, what they look for in this process, and what a SaaS product needs to have in place before entering any security due diligence process. Enjoy the read.
Penetration Testing Is No Longer a Differentiator
For years, penetration testing was treated as something technology companies did when they were “big enough.” The perception was that startups and growing products had other priorities and that security could wait until the operation matured.
That reasoning worked when enterprise contracts were closed based on functionality and price. Today, it no longer does.
The maturity of security teams within large companies has changed the way software vendors are evaluated. Infosec teams have gained veto power over contracts with SaaS providers that cannot demonstrate that their products have been tested by external professionals. Penetration testing has gone from being a project to be done “eventually” to becoming a requirement for entering relevant business negotiations.
Why Enterprise Customers Require Penetration Testing
When a company adopts a SaaS product, it is effectively bringing that product into its security perimeter. Its customers’ and employees’ data, as well as operational information, will flow through the vendor’s environment.
This means that a vulnerability in the SaaS product is, in practice, a vulnerability within the customer’s environment. The customer remains responsible for any incident affecting its data, regardless of where the technical flaw occurred. The responsibility that does not transfer when technology is outsourced is the same principle that leads enterprise customers to demand evidence before signing any contract with a software vendor.
As a result, the process of evaluating a SaaS vendor now includes questions that were not commonly asked five years ago.
What the Customer’s Security Team Checks
The assessment typically covers specific areas that go beyond a conversation about features. The customer’s infosec team wants to know whether the product has undergone testing conducted by professionals with internationally recognized certifications, which attack vectors were tested, what vulnerabilities were found, and what was done to remediate them.
The penetration testing report is the document that answers these questions. Without it, the SaaS provider has no concrete evidence to present, only claims. And claims do not move the process forward during due diligence.
The Impact of Industry and Data Volume
The more sensitive the data processed by the SaaS product, the more rigorous the assessment process. A product that handles health data, financial data, or children’s data faces even more specific requirements, including compliance with industry standards that may require more frequent testing cycles.
Even products that process seemingly simple data, such as employee information or access logs, are being scrutinized more closely because they can represent potential entry points for lateral movement within the customer’s environment.
Why Investors Have Also Started Requiring It
The requirement for penetration testing does not come only from the commercial side. During investment rounds, particularly from Series A onward, technical due diligence has begun to include security assessments with a level of depth that was not common until recently.
The reason is straightforward: an investor entering a SaaS product is taking on exposure to the risk of a security incident. A vulnerability exploited after the investment can result in regulatory fines, lost contracts, and reputational damage with a direct impact on valuation.
What an Investor’s Technical Due Diligence Evaluates
The process varies by investor, but certain areas appear consistently. Incident history and how incidents were handled. Access policies and internal controls. Compliance with the LGPD and industry-specific requirements. And the existence of security testing conducted by independent third parties.
A product that has never been externally tested is, by definition, a product whose security risk is unknown. Technology investors with experience understand that environments that have never been tested under real-world pressure reveal their weaknesses at the least convenient possible moment.
Penetration Testing as a Sign of Maturity
In addition to being technical evidence, penetration testing is a sign of an organization’s security posture. A product that undergoes annual testing with a specialized firm, addresses the vulnerabilities identified, and maintains documented records demonstrates that security is treated as an ongoing process rather than a reaction.
This distinction matters to investors because it indicates how the team is likely to respond when a real problem emerges. Founders with a history of security testing have a more calibrated perspective on risk than those who have never independently put their product to the test.
What a SaaS Product Needs Before Due Diligence
Entering an enterprise negotiation or investment round without security documentation puts the product on the defensive from the outset. Building this foundation beforehand is what allows the company to enter these conversations from a position of preparedness.
The minimum expected by mature customers and investors includes a recent penetration testing report conducted by a specialized firm, documentation of what was remediated after the test, a formalized information security policy, and a defined incident response process.
The recommended frequency for actively growing products is annual penetration testing, complemented by monthly vulnerability assessments. Products in regulated industries or involved in contract negotiations may need shorter cycles depending on the specific requirements of the customer or investor.
What Happens When a SaaS Product Does Not Have This Track Record?
The most common scenario is for the business to stall during the technical assessment phase. The product moves through every stage of the sales process, generates genuine customer interest, and then runs into a security questionnaire that it cannot answer with evidence.
In some cases, the customer gives the vendor a deadline to provide the documentation. Conducting a penetration test on short notice to meet a business deadline is possible, but the report produced under those circumstances rarely has the depth that an experienced infosec team considers sufficient.
The cost of building this foundation before entering significant negotiations is significantly lower than the cost of losing contracts that have already reached an advanced stage of evaluation.
STWBrasil conducts annual penetration testing for SaaS products with internationally certified professionals, structured reporting for technical teams and executive leadership, and traceable documentation for due diligence processes. If your company is preparing for enterprise contracts or an investment round, talk to our team.
