The Shared Security Model - For SaaS Product Teams

Cloud providers protect the infrastructure. You protect everything above it. Most mid-market SaaS teams haven't drawn those boundaries clearly enough to satisfy enterprise CISO scrutiny.

The customer asked the question casually. The account manager smiled. The pre-sales architect nodded. Nobody wanted to complicate the deal. Nobody wanted to slow down a promising opportunity.

The contract got signed. Nine months later, during a customer audit, both parties discovered they had completely different expectations about security ownership. The customer believed the SaaS provider was responsible for several operational security controls. The SaaS provider believed those controls belonged to the customer.

Neither side was entirely wrong. Neither side was entirely right. The real problem started much earlier. It started with a missing Shared Security Model conversation.

The Problem Is Not Technology. The Problem Is Assumption.

When SaaS companies discuss security, the conversation usually revolves around secure coding practices, cloud security, vulnerability management, and penetration testing. All important topics. But there is another risk that rarely appears in risk registers: Assumption Risk.

A customer assumes you own a security responsibility. You assume they own it. Nobody documents it. Nobody clarifies it. The misunderstanding remains hidden until an audit, incident, compliance review, or contract dispute exposes it.

Why Enterprise CISOs Ask Difficult Questions

Many SaaS teams become uncomfortable when a CISO starts asking detailed questions such as:

• Who owns identity governance?
• Who reviews privileged access?
• Who manages data classification?
• Who owns encryption key management?
• Who is responsible for incident response activities?
• Who owns regulatory compliance obligations?

These questions are not obstacles. They are attempts to understand risk ownership. A mature CISO is trying to determine whether your organisation understands its own security responsibilities. Teams that answer confidently build trust. Teams that struggle create uncertainty.

The Hidden Challenge - Many Customers Don't Have CISOs

Interestingly, some of the biggest risks emerge from organisations that do not have dedicated security leadership. Mid-market companies often have excellent business teams and capable IT staff, but they may lack a CISO, Security Architect, or Governance function.

In these environments, customers often simplify security ownership into a single, dangerous assumption: "We're moving to SaaS. Therefore security becomes the SaaS vendor's responsibility." While understandable, no SaaS platform can completely eliminate customer responsibilities.

The Silent Liability Created During Sales Conversations

Most obligation problems are created during discovery calls, demo sessions, and pre-sales conversations. A customer asks, "Will you take care of security?" and a sales team responds, "Absolutely."

Security is rarely transferred; it is shared. If those responsibilities are not clearly explained, expectations begin drifting apart from day one.

Where Mavis Dx Helps

At Mavis Dx, we frequently encounter SaaS product companies that have invested heavily in technology security but have not fully translated those investments into customer assurance. We help SaaS organisations:

• Review security compliance readiness from a customer assurance perspective
• Develop practical Shared Security Models aligned to SaaS business realities
• Create responsibility matrices that customers can easily understand
• Prepare sales and pre-sales teams for enterprise CISO discussions