Why Third-Party Risk Is the Biggest Gap in Your Clients’ Security Posture

The next major breach hitting your clients probably won’t come from inside their walls. It’ll come through a vendor they trust, a SaaS tool their finance team signed up for, or a subcontractor nobody in IT knows about. That’s the new attack surface, and most organizations are underprepared for it.

Cynomi’s new guide, Securing the Modern Perimeter: The Rise of Third-Party Risk Management, makes the case that TPRM is no longer a compliance formality. It’s a frontline security challenge and a defining growth opportunity for MSPs and MSSPs who get ahead of it.

The Modern Perimeter Has Expanded

For decades, cybersecurity strategy revolved around a defined perimeter. Firewalls, endpoint controls, and identity management systems were deployed to protect assets within a known boundary.

That boundary has dissolved.

Today, client data lives in third-party SaaS applications, flows through vendor APIs, and is processed by subcontractors that internal IT teams may not even know about. Security no longer stops at owned infrastructure. It extends across an interconnected ecosystem of external providers, and the accountability that comes with it extends there, too.

The 2025 Verizon Data Breach Investigations Report found that third parties are involved in 30% of breaches. IBM’s 2025 Cost of a Data Breach Report puts the average remediation cost of a third-party breach at $4.91 million. Third-party exposure has become a core feature of modern business operations, not an edge case.

For proactive service providers, this shift creates a substantial opportunity. Organizations facing mounting third-party threats are looking for strategic partners who can own, streamline, and continuously manage the entire third-party risk lifecycle. Service providers who step into that role can introduce new service offerings, deliver higher-value consulting, and establish themselves as central to their clients’ security and compliance programs.

From Checkbox to Core Risk Function

The traditional approach to vendor risk relied on annual questionnaires, spreadsheets, and the occasional follow-up email. It was never adequate, and it’s especially costly now.

Regulatory frameworks like CMMC, NIS2, and DORA have raised the bar significantly. Compliance now requires demonstrable, ongoing oversight of third-party controls, not a point-in-time snapshot from twelve months ago. Boards are asking harder questions about vendor exposure. Cyber insurers are scrutinizing supply chain hygiene before writing policies. And clients who’ve watched competitors absorb the fallout from a vendor’s breach understand that “it wasn’t our system” doesn’t limit their liability.

The market is responding accordingly. Global TPRM spending is projected to grow from $8.3 billion in 2024 to $18.7 billion by 2030. Organizations are treating vendor oversight as a governance function, on par with incident response or identity management, because the cost of ignoring it has become too high.

For service providers, that budget allocation is a clear signal. Clients are actively looking for partners who can own and manage vendor oversight as a defined, ongoing service.

Scaling TPRM Is Where Most Providers Get Stuck

Most MSPs and MSSPs recognize the opportunity. The hesitation comes down to delivery, and specifically to whether TPRM can be executed profitably at scale.

Traditional vendor review relies on fragmented workflows and manual analysis. Custom assessments must be sent, tracked, and interpreted, and risk must be tiered against each client’s specific obligations. This work often falls to senior consultants, making it expensive and hard to delegate.

Multiplying this effort across a client portfolio with different vendor ecosystems, compliance needs, and risk tolerances can be unsustainable. This is why many providers offer TPRM as a one-off project instead of a recurring managed service.

But that’s also where the opportunity lies. Cynomi’s Securing the Modern Perimeter guide outlines how structured, technology-enabled TPRM can shift from a bespoke consulting engagement into a repeatable, high-margin service line that strengthens client retention, drives upsell, and positions service providers as integral partners in their clients’ security programs.