How Can Modern Enterprises Secure Service Accounts and Reduce the Risks They Create?

Introduction

Service accounts play an important role in keeping applications, systems, and automated workflows running without human involvement. From accessing databases and shared files to running backups and connecting different applications, these non-human identities help organizations automate everyday tasks across cloud and on-premises environments.

But the same access that keeps automated processes running can also create security risks. Service accounts may have access to sensitive data, use long-lived credentials, or accumulate excessive privileges over time. Unlike human identities, they can operate continuously in the background, making it harder for security teams to know which accounts are still being used, who owns them, and whether their access is still required.

This makes service account security an important part of non-human identity security. Organizations need to know where these accounts exist, what systems they can access, how their credentials are protected, and when their access should be removed. In this article, we’ll look at the types of service accounts, the security risks they create, and practical ways to secure and manage them.

What are service accounts?

Service accounts are non-human identities used by applications, services, and automated processes. They run in the background to automate tasks, access files and databases, and connect services across systems.

For example, if you want to back up your data, a system can use a service account to automatically access a database and store backups every night, without a person having to log in.

Types of Service Accounts

Organizations use different types of service accounts depending on their systems and environments. Here are some common examples:

Unix and Linux: Services such as init and inetd run in the background and can manage or start other processes without direct human interaction. Linux also uses dedicated system accounts for services and applications.

Cloud: Cloud platforms provide identities for applications and workloads to authenticate and access cloud resources. For example, Google Cloud service accounts can be used by applications or compute workloads to access resources based on their assigned permissions.

Windows: Windows has different types of service accounts, each providing different levels of access. For example, LocalSystem and NetworkService are built-in accounts used to run Windows services. Choosing the right account helps ensure that a service has only the permissions it actually needs.

Why Do Enterprises Use Service Accounts?

Enterprises use service accounts to automate work, run persistent applications, scheduled jobs, scripts, integrations, and cloud workloads that need non-human access to systems and data. It provides an easier way because they constantly support databases, business applications, and websites that need access to network or local resources using less human intervention.

Here are some common types of service accounts:

1. Database Service Accounts

As the name suggests, these service accounts are used by database systems or applications that directly connect to a database and perform tasks automatically. The application can use a dedicated service account with the permissions it needs to access the database.

Example:
A payroll application may need to connect to an employee database every night to retrieve salary information and generate reports. A service account can allow the application to connect to the database and access only the information required for that process.

2. Web Application Service Accounts

Web applications often need to communicate with other systems and databases to perform tasks in the background without relying on a human user's account. A service account allows the application to access the systems and resources it needs to perform these tasks.

Example:
An organization's employee portal may need to retrieve employee information from a database whenever someone logs in. The web application can use a service account to connect to that database and retrieve the required information automatically.

3. File Share Service Accounts

File share service accounts are used when applications or automated processes need to access files stored in shared locations. These accounts can be given specific permissions to read, write, move, or manage files depending on what the process needs to do.

Example:
A company may have an automated process that collects invoices from different departments and moves them to a central finance folder. Instead of giving an employee's account access to all these folders, the process can use a dedicated service account with the required file permissions.

4. Messaging Service Accounts

Messaging service accounts are used when an application needs to communicate with users or other systems. They allow applications and automated processes to send, receive, or process messages and emails.

Example:
A monitoring application may detect that a server is unavailable and automatically send an alert to the IT team. The application can use a service account to send that notification without requiring an employee to manually send the email.

5. Backup Service Accounts

Backup service accounts help process scheduled backups. These accounts allow backup applications to access systems, copy data, and store backup files.

Example:
An organization may schedule its backup system to copy important databases and files every night. The backup software can use a dedicated service account to access those systems and transfer the data to a secure backup location.

6. Application Integration Service Accounts

Application integration service accounts are created to allow different applications or systems to communicate and exchange data. They provide an identity that an application can use when connecting to another system.

Example:
A company's HR system may need to send new employee information to its IT system so that accounts and access can be created automatically. A service account can allow the HR application to communicate with the IT system and transfer the required information.

Why Securing a Service Account Matters

Each of these service accounts exists for a different purpose, but they have one thing in common: they allow systems and automated processes to perform tasks without human involvement.

The security risk comes when these accounts are given more permissions than they need, shared across multiple systems, left active after they are no longer required, or protected with long-lived credentials. This is why organizations need proper access control, credential management, monitoring, and lifecycle management for service accounts.

Service Accounts Considered Risky If Not Supervised, Why?

Service accounts are versatile; they automate tasks with minimal human intervention. However, they often have access to important systems and data, which can make them vulnerable to threats if not properly secured and monitored.

In 2023, a malicious actor gained unauthorized access to Okta’s customer support system through a compromised service account. The attacker had access to customer support cases and was able to access files associated with 134 Okta customers. This incident shows the importance of protecting service-account credentials and continuously monitoring their activity.

What are the risks of using service accounts?

Excessive Privileges: Overprivileged service accounts can pose a significant security risk because they may have access to sensitive systems and data. Google Cloud's H1 2025 Threat Horizons Report found that 46.4% of the security alerts it observed in H2 2024 involved overprivileged service accounts.

Expose Credentials: Service accounts need credentials to authenticate and perform tasks. If these credentials are stored insecurely, such as in source code or scripts, attackers may be able to obtain and misuse them. The risk becomes even greater when the credentials provide privileged access to critical systems.

Continuous Monitoring and Behavioral Detection: Every form of automation comes with advantages and challenges, and service accounts are no exception. Because service accounts are used by machines rather than people, traditional MFA methods designed for human users don't always apply. At the same time, their automated activity can also make it difficult to distinguish normal behavior from suspicious activity. That's why organizations need behavioral monitoring to understand what is normal and identify what isn't.

Persistent Credentials: Credentials that aren't regularly changed can become a security risk. Passwords are sometimes set during installation and left unchanged because changing them could disrupt critical processes. However, if these credentials are compromised, attackers may use them to maintain access to an organization's network for an extended period without being detected.

What Makes It Difficult in Securing Service Accounts?

Non-Human Identities (NHIs)

Service accounts are used for automation, allowing systems and applications to perform tasks without human involvement. They are non-human identities (NHIs) and typically cannot use conventional multi-factor authentication (MFA) because there is no human interaction during authentication. Over time, they can accumulate excessive privileges and retain access to sensitive resources.

Credential Management

Even when organizations try to change or rotate their passwords, there is a risk of breaking dependencies on applications, scripts, or pipelines that rely on those credentials. As a result, credentials may remain static for long periods. Passwords and keys may also be hardcoded into configuration files, stored in plaintext, or shared across multiple systems and teams.

Continuous Monitoring

Service accounts can also become orphaned and remain active long after they are needed. Unlike human identities, they are not automatically tied to HR lifecycle processes. When a project ends, or an employee leaves, organizations may not know whether a service account is still being used, who owns it, or whether it can be safely deactivated.

Role-Based Access Control

An even bigger challenge is the lack of clear ownership and lifecycle management for service accounts. Without defined accountability, organizations can struggle to discover, monitor, review, rotate, and deprovision these identities effectively.

What Happens If a Service Account is Compromised?

Service accounts may have privileged access to systems, applications, automated workflows, and sensitive data. If compromised, attackers can abuse these trusted non-human identities to access internal resources and remain undetected for longer periods.

With privileged access, attackers may gain administrative control over connected systems, depending on the permissions assigned to the service account. They can access, copy, or export sensitive data and may use the compromised identity for lateral movement from one system or server to another. Such breaches can also expose organizations to regulatory penalties and legal liabilities when sensitive data is not adequately protected.

A compromised service account can also disrupt automated workflows and critical operations by modifying configurations, disabling applications, or interfering with automated processes. This can result in operational downtime, financial losses, and reputational damage.

Customer Trust: A breach involving sensitive data accessed through a service account can erode customer confidence and damage the organization's reputation, raising questions about its security readiness.

NIST SP 800-53 Rev. 5 provides relevant guidance by connecting access control, identity management, logging, and contingency planning as complementary security measures rather than treating them as isolated controls.

One important thing: I would not add “service accounts are difficult to detect because they bypass MFA” again in this section unless you are specifically creating a “Why Are They Hard to Detect?” subsection. Your source has that as a separate point, and keeping it separate will make the article logically cleaner.

How Do You Secure Service Accounts?

Service accounts are essential for running automated processes, applications, and workflows, but they also create unique security risks. Unlike human identities, service accounts can operate continuously, use long-lived credentials, and accumulate excessive privileges without proper oversight.

Top 10 Ways to Improve Service Account Security

1. Non-human identities (NHIs), including service accounts and machine identities, operate continuously in the background to support automated processes and workflows. Unlike human identities, they often cannot use conventional user-oriented security controls such as interactive MFA. Effective service account security therefore requires strong access management, access control, credential management, lifecycle management, and continuous monitoring.
    
2. Start by identifying all service accounts across cloud and hybrid environments, including Active Directory, cloud services, SaaS applications, and on-premises environments. Build an inventory of these non-human identities and assign clear ownership to a human team member or project owner. This helps security teams understand which identities exist, why they exist, what systems they access, and when they should be retired.
    
3. Apply the principle of least privilege and give service accounts only the permissions required to perform their specific tasks. Avoid excessive privileges and broader access than necessary. Where supported, use role-based access control (RBAC), permission boundaries, IAM conditions, or conditional access policies to restrict how service accounts can access systems and resources. Regularly review permissions to identify and remove unnecessary access.
    
4. Reduce persistent access wherever possible. Instead of relying on static credentials, organizations should use short-lived access tokens, managed identities, workload identity federation, or other mechanisms that reduce reliance on long-lived credentials. When long-lived service account credentials, passwords, or API keys cannot be avoided, automate their rotation through appropriate credential-management solutions. If credential rotation fails, generate an alert and investigate it promptly.
    
5. Protect non-human credentials from credential exposure. Passwords, API keys, and other machine credentials should not be hardcoded in code or configuration files or shared across multiple systems and teams. Use appropriate secrets-management mechanisms to protect credentials and control access to them.
    
6. Disable interactive logon for service accounts where appropriate. Service accounts are designed for automated access and machine-to-machine communication, not for human users to access systems interactively. Configure platform-specific security controls to prevent unauthorized interactive authentication and alert on unexpected login attempts involving service accounts. In environments that support them, conditional access policies can provide additional restrictions.
    
7. Use continuous monitoring and identity threat detection to establish normal behavioral patterns for service accounts. Monitor unusual data access, unexpected activity times, abnormal transaction volumes, unfamiliar network destinations, and attempts to access systems or sensitive data outside the account's normal responsibilities. This can help security teams detect credential compromise, misuse, or potential lateral movement across multiple systems.
    
8. Just-in-time (JIT) access can further reduce the risks associated with persistent privileged access. Where supported, temporarily grant elevated privileges when an automated workflow or deployment requires them and automatically remove those privileges after the task is completed.
    
9. Service accounts also require proper lifecycle management. Disable unused accounts for a defined verification period before permanently deleting them. This helps organizations identify hidden dependencies and prevents critical automated workflows from unexpectedly breaking. Regularly review service accounts to identify orphaned identities, unused credentials, and identity sprawl.
    
10. Finally, organizations should prepare an incident-response plan for compromised service accounts. The plan should define how to revoke or rotate compromised credentials, contain the affected identity, assess dependencies, restore affected automated workflows, and maintain operational continuity. This is particularly important because compromised service accounts can provide attackers with trusted access to sensitive resources and enable lateral movement across connected systems.

Conclusion

Service accounts are necessary for modern IT environments, but leaving them unmanaged can create security gaps that are difficult to see. An account created for one application or automated process can remain active long after it is needed, retain excessive privileges, or continue using long-lived credentials without anyone realizing the risk.

Securing these identities starts with knowing what exists and who is responsible for it. Organizations should apply least privilege, protect service account credentials, limit persistent access, monitor activity, and regularly review whether each account still needs its current permissions. Proper lifecycle management is equally important to identify unused or orphaned accounts and remove them safely.

As organizations continue to expand their use of cloud services, automated workflows, and machine-to-machine communication, non-human identity management needs to become part of the broader identity security strategy. By partnering with TechDemocracy, organizations can strengthen their approach to non-human identity security, gain better visibility into service accounts, control unnecessary access, reduce excessive privileges, and establish stronger lifecycle management. This enables security teams to manage service accounts more effectively while reducing the security risks associated with unmanaged non-human identities.