Modern software-as-a-service (SaaS) applications are no longer evaluated solely on their core features, but on how well they integrate with the rest of a company’s software stack.

Customers want their customer retention management (CRM), support platform, communication tools, and project management software to connect to the workflows their teams already rely on. In response, SaaS vendors today commonly offer integration marketplaces that let users connect their workflows across tools.

Unfortunately, the pressure to build large integration marketplaces is outpacing many companies’ ability to secure them properly. The growing number of SaaS integrations also greatly expands an application’s attack surface, and each new integration adds another layer of complexity. 

At the same time, these integrations don’t always receive the same level of care and attention as the primary product when it comes to security. This is a mistake. Because integrations are part of the product surface area, SaaS providers must treat integration security and product security as equally critical.

Integrations are a necessity in today’s sprawling SaaS market

Okta’s 2025 Businesses at Work report found that the average company now uses 101 apps, crossing the 100-app mark for the first time. Clearly, tool sprawl is becoming a major issue. Employees are spending more of their day moving between disconnected systems, and this constant context switching creates a frustrating employee experience.

Integrations help reduce that friction by allowing users to complete workflows without switching tools. Connecting Slack to GitHub lets developers initiate actions in their code repositories directly from within the app they use for communication. Adding project management integrations, such as Trello, further reduces context switching by allowing them to review project updates without leaving Slack. 

When evaluating a new SaaS application, companies often look at its available integrations to ensure that it supports the tools their teams already rely on. If there isn’t an integration with a tool they use frequently, that might be a dealbreaker. 

In other words, integrations have moved beyond being optional add-ons to become necessary operational infrastructure in modern SaaS environments. However, the same integrations that reduce context switching for users can also create new risk if they are not properly secured.

The hidden security cost of expanding integration ecosystems

Every integration expands a company’s attack surface by creating new pathways for data movement, authentication, and system access. Unlike standalone applications, integrations operate across multiple systems, and a single weakness can expose sensitive data, disrupt workflows, or create unintended access to connected platforms. 

As SaaS ecosystems become more interconnected, each new integration introduces additional dependencies, permissions, APIs, and authentication flows that must be maintained and monitored.

At many companies, integrations are treated as secondary features instead of critical infrastructure and may not receive the same level of architectural scrutiny, security testing, monitoring, or governance as the core product. This disconnect can have serious implications because integrations often facilitate data movement across entire organizations. A single compromised integration can affect multiple downstream business processes, causing operational, financial, and reputational damage. 

As organizations become more dependent on interconnected SaaS ecosystems, the operational impact of integration failures will continue to grow. 

Secure integration begins with secure design and data protection practices

Many of the same security principles that apply to application development also apply to integrations, but integrations introduce additional unique challenges because they sit between systems and often have elevated access to sensitive workflows and data. 

Secure integrations start with limiting unnecessary access. Integrations should only have access to the systems and data necessary to perform their intended tasks, as overly broad permissions are difficult to manage securely. 

SaaS providers should also prioritize simplicity whenever possible, given that complex architectures and heavy customization can create additional opportunities for misconfiguration and abuse. 

Protecting data as it moves between systems is equally critical. This can be achieved by encrypting data during transmission and, when possible, at rest. Input validation can ensure that only properly formatted data is processed and stored, helping prevent malicious data from being injected into the system. 

Finally, as with all software projects, it’s important to maintain proper version control, implement effective error-handling strategies, and comply with relevant regulations, such as General Data Protection Regulation (GDPR) or Health Insurance Portability and Accountability Act (HIPAA). 

The future of SaaS depends on trusted integrations

A well-planned strategy for SaaS integration security enables companies to ensure add new integrations that benefit customers without also introducing unnecessary security risks. 

Given how much data access is granted to SaaS integrations, customers can only trust those platforms where they’re sure their data is safe, and any security incident involving an integration will greatly diminish that trust. 

The SaaS companies that succeed long term won’t be the ones with the largest integration marketplaces, but the ones that build secure, reliable integrations customers can trust as part of their everyday workflows. Those that treat integration security with the same care as they apply to their core product's security will be better positioned to earn customer trust as ecosystems expand.