Third-party access refers to access granted to external vendors, contractors, service providers, and business partners to an organization’s systems, applications, networks, or data. Organizations grant this access to enable third parties to perform services, maintain systems, support operations, or collaborate on business activities.
While third-party access helps organizations improve efficiency and access specialized expertise, it also expands the attack surface. Every external account, integration, and connection introduces additional security risks that your organization must manage carefully. That’s why, third-party access management is an important cybersecurity practice for controlling and monitoring how external users connect to your organizational resources.
Who counts as a third party?
A third party is any external individual or organization that requires access to your systems, applications, or data. Many organizations grant third-party remote access to support systems, perform maintenance, or deliver services from external locations. Third parties include your vendors, contractors, managed service providers (MSPs), consultants, auditors, and business partners.
Third-party access is not limited to human users though. It also includes non-human identities such as application programming interface (API) keys, software integrations, service accounts, automated scripts, and other machine-to-machine connections that third parties use to interact with your IT systems.
Why third-party access is a security risk
Third-party access creates security challenges as organizations often have less visibility and control over external users than they have over employees. If your vendor’s credentials are stolen or their systems are compromised, attackers may infiltrate your organization.
Excessive permissions are another issue. Third parties are frequently granted broad access to simplify onboarding or support processes, even when they only need limited privileges. Access can also remain active long after a contract ends, creating exposure risks. Effective vendor access management helps you ensure that vendors receive only the permissions necessary.
Compromised vendor tools, insecure integrations, and shared vendor accounts can further increase the likelihood of unauthorized access. Without proper oversight, you may struggle to detect suspicious third-party activity before it leads to a security incident.
Best practices for securing third-party access
You should implement strong controls to reduce the risks associated with third-party access.
Third-party access management best practices
Inventory every third-party account
Enforce least privilege and time-bound access
Require multi-factor authentication
Get rid of shared accounts
Monitor and record third-party sessions
Review third-party access regularly
Inventory every third-party account
Maintain a complete inventory of all third-party accounts, including both human and non-human identities. The inventory should cover vendors, contractors, consultants, service providers, API integrations, service accounts, automated scripts, and other machine-to-machine connections.
Having a clear understanding of who and what can access your organizational resources helps your security team reduce blind spots, identify unnecessary access, and respond more effectively to potential security incidents.
Enforce least privilege and time-bound access
Third parties should only receive the minimum level of access required to perform their assigned tasks. Applying the principle of least privilege reduces the risk of unauthorized access and limits the potential impact of compromised accounts.
You should also implement time-bound access controls that automatically expire when a contract, project, or task ends, reducing standing privileges and preventing dormant accounts from becoming security liabilities.
Require multi-factor authentication
Multi-factor authentication (MFA) adds an additional layer of protection by requiring users to verify their identity through multiple authentication factors.
Even if a password is stolen, guessed, or compromised through phishing attacks, MFA significantly reduces the likelihood of unauthorized access because attackers must also provide an additional verification factor.
Get rid of shared accounts
You should also ensure that each vendor or contractor has an individual account rather than relying on shared credentials. Individual accounts improve accountability, make auditing easier, and help security teams accurately track user activity and investigate suspicious behavior.
If shared accounts still must be used, implement secondary authentication mechanisms to identify and differentiate the actions of individual users accessing the same account, ensuring accountability.
Monitor and record third-party sessions
Continuous monitoring and recording of third-party sessions provide visibility into how external users interact with critical systems and sensitive data.
Session monitoring can help you detect unusual activity, identify policy violations, and investigate security incidents more efficiently. User activity recording also creates valuable audit trails that support compliance checks and forensic investigations.
Review third-party access regularly
Regular access reviews help you verify that third-party permissions remain appropriate and aligned with current business needs. Your security team should periodically assess vendor accounts, remove unnecessary privileges, and identify inactive or unused access.
When a contract ends, organizations should promptly revoke all associated access rights to eliminate unnecessary exposure and reduce the risk of unauthorized access.
Overall, secure third-party access security requires both preventive and detective controls.
Syteca is a privileged access management (PAM) platform with native identity threat detection and response (ITDR) capabilities that help organizations provide secure, controlled access to vendors, contractors, and other external users. Through centralized access provisioning, granular privilege controls, and secure credential management, Syteca enables you to grant vendors exactly the access they need while reducing unnecessary security exposure.
With vendor session monitoring and recording, real-time alerts, and detailed audit trails, you gain the visibility needed to detect suspicious behavior, investigate incidents, and reduce the risks associated with third-party access. Syteca provides a comprehensive approach to securing your organization’s assets against third-party security risks.
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FAQ
A common example of third-party access is a managed service provider receiving access to an organization’s servers to perform maintenance and troubleshooting. Another example is a software vendor accessing a customer’s environment to deploy updates, provide technical support, or monitor system performance.
Third-party access is risky because external users may become an entry point for attackers. Stolen vendor credentials, compromised third-party tools, excessive permissions, and forgotten accounts can all create opportunities for attackers to infiltrate into your systems. Without proper controls and monitoring, organizations may have limited visibility into third-party activities and insufficient capacity for implementing effective security measures.