Cybersecurity
The Hidden Risk of Integrations: A Checklist for Vetting Third-Party Apps (API Security)
Modern businesses depend on third-party apps for everything from customer service to cloud storage. SecurityScorecard found that 35.5% of breaches in 2024 involved third-party access. Use this checklist to vet integrations before you connect them to your systems.
Modern businesses depend on third-party apps for everything from customer service and analytics to cloud storage and security. But this convenience comes with risk: every integration introduces a potential vulnerability. SecurityScorecard's 2025 Global Third-Party Breach Report, which analyzed 1,000 breaches, found that 35.5% of breaches in 2024 involved third-party access, and the company called that figure likely conservative.
The good news? These risks can be managed. This article highlights the hidden dangers of third-party API integrations and provides a practical checklist to help you evaluate any external app before adding it to your system.
Why Third-Party Apps Are Essential in Modern Business
Simply put, third-party integrations boost efficiency, streamline operations, and improve overall productivity. Most businesses do not create each technology component from scratch. Instead, they rely on third-party apps and APIs to manage everything from payments to customer support, analytics, email automation, chatbots, and more. The aim is to speed up development, cut costs, and gain access to features that might take months to build internally.
What Are the Hidden Risks of Integrating Third-Party Apps?
Adding third-party apps to your systems invites several risks, including security, privacy, compliance, and operational and financial vulnerabilities.
Security Risks
Third-party integrations can introduce unexpected security risks into your business environment. A seemingly harmless plugin may contain malware or malicious code that activates upon installation, potentially corrupting data or allowing unauthorized access. Once an integration is compromised, hackers can use it as a gateway to infiltrate your systems, steal sensitive information, or cause operational disruptions.
Privacy and Compliance Risks
Even with strong contractual and technical controls, a compromised third-party app can still put your data at risk. Vendors may gain access to sensitive information and use it in ways you never authorized, such as storing it in different regions, sharing it with other partners, or analyzing it beyond the agreed purpose. For instance, misuse of a platform could lead to violations of data protection laws, exposing your organization to legal penalties and reputational damage.
Operational and Financial Risks
Third-party integrations can affect both operations and finances. If an API fails or underperforms, it can disrupt workflows, cause outages, and impact service quality. Weak credentials or insecure integrations can be exploited, potentially leading to unauthorized access or costly financial losses.
What to Review Before Integrating a Third-Party API
Before you connect any app, take a moment to give it a careful check-up. Use the checklist below to make sure it is safe, secure, and ready to work for you.
1. Check Security Credentials and Certifications: Make sure the app provider has solid, recognized security credentials, such as an ISO/IEC 27001 certification or a recent SOC 2 Type II report, or can show how its program aligns with a framework such as the NIST Cybersecurity Framework. Note that NIST publishes frameworks but does not certify companies, so a vendor claiming to be "NIST certified" deserves follow-up questions. Ask for audit or penetration test reports and see if they run a bug bounty program or have a formal vulnerability disclosure policy. These show the vendor actively looks for and addresses security issues before they become a problem.
2. Confirm Data Encryption: You might not be able to inspect a third-party app directly, but you can review their documentation, security policies, or certifications like ISO 27001 or SOC. Ask the vendor how they encrypt data both in transit and at rest, and make sure any data moving across networks uses TLS 1.2 or later, with TLS 1.3 preferred. Older protocols such as SSL and TLS 1.0 or 1.1 should be disabled.
3. Review Authentication and Access: Make sure the app uses modern standards such as OAuth 2.0 and OpenID Connect rather than shared passwords or long-lived API keys. Review exactly which permissions, or scopes, the app requests when someone connects it to Microsoft 365 or Google Workspace. Confirm it follows the principle of least privilege, giving users only the access they truly need. Credentials should be rotated regularly, tokens kept short-lived, and permissions strictly enforced.
4. Check Monitoring and Threat Detection: Look for apps that offer proper logging, alerting, and monitoring. Ask the vendor how they detect vulnerabilities and respond to threats. Once integrated, consider maintaining your own logs to keep a close eye on activity and spot potential issues early.
5. Verify Versioning and Deprecation Policies: Make sure the API provider maintains clear versioning, keeps changes backward compatible within a version, and gives advance notice when features are being retired.
6. Rate Limits and Quotas: Prevent abuse or system overload by confirming the provider supports safe throttling and request limits.
7. Right to Audit and Contracts: Protect yourself with contractual terms that allow you to audit security practices, request documentation, and enforce remediation timelines when needed.
8. Data Location and Jurisdiction: Know where your data is stored and processed, and ensure it complies with local regulations.
9. Failover and Resilience: Ask how the vendor handles downtime, redundancy, fallback mechanisms, and data recovery, because no one wants surprises when systems fail.
10. Check Dependencies and Supply Chain: Get a list of the libraries and dependencies the vendor uses, especially open-source ones. Assess them for known vulnerabilities to avoid hidden risks.
Vet Your Integrations Today
No technology is ever completely risk-free, but the right safeguards can help you manage potential issues. Treat third-party vetting as an ongoing process rather than a one-time task. Continuous monitoring, regular reassessments, and well-defined safety controls are essential. For financial institutions covered by the FTC Safeguards Rule, this is also a legal requirement: 16 CFR 314.4(f) requires you to select service providers capable of safeguarding customer information, require those safeguards by contract, and periodically assess your providers based on the risk they present.
If you want to strengthen your vetting process and get guidance from experts with experience building secure systems, we can help. Our team has firsthand experience in cybersecurity, risk management, and business operations, and we provide practical solutions to help you protect your business and operate more safely.
Build your confidence, tighten your integrations, and make sure every tool in your stack works for you rather than against you. Contact Cyber One Solutions to review the third-party apps connected to your business systems.