In Brief: Service Principals in cloud environments are a growing attack target because they are monitored less frequently and specialized secret-scanning tools like TruffleHog can automatically discover and validate exposed credentials.
While enterprises secure user accounts more effectively, non-human cloud identities (Service Principals) are increasingly coming into attackers’ focus. These accounts often have weak monitoring and are provisioned with overly broad permissions.
Service Principals are machine identities used by applications, scripts, and automation processes to authenticate against cloud services such as Microsoft Entra ID (formerly Azure Active Directory). Unlike traditional user accounts, these accounts often lack continuous monitoring and consistent access governance. According to security services provider Ontinue, attackers exploit precisely these governance gaps.
Hackers rely on specialized secret-scanning tools like TruffleHog, which systematically search source code, Git repositories, configuration files, and CI/CD artifacts for exposed credentials. These tools actively validate discovered secrets against target systems—such as OAuth authentication endpoints of Microsoft Entra ID. When Client IDs and Client Secrets are found in public GitHub repositories or poorly secured CI/CD pipelines, the tools immediately test them. Upon successful validation, attackers obtain legitimate Access Tokens and thereby gain access to cloud resources and their associated permissions. This automation drastically shrinks the time window between leak and exploitation.
Ontinue recommends five concrete protective measures: First, Client IDs and Secrets should not be stored in plain text in configuration files or scripts, but rather provisioned via Secret Vaults or cloud-side Managed Identities. Second, targeted monitoring of unusual authentication patterns is required, coupled with a significant reduction in often overly generous permission grants. Third, OAuth and Microsoft Graph activities should be audited, as attackers, once successfully authenticated with valid Access Tokens, can access APIs and data in SharePoint, Exchange, or OneDrive. Fourth, many enterprises lack visibility into existing Service Principals and machine identities, which also hampers governance. Fifth, CI/CD pipelines and development environments must be secured, as they rank among the most common locations where exposed credentials are discovered.
Theus Hossmann, CTO at Ontinue, summarizes the situation: “Machine identities have long become part of the attack vector.” While security concepts typically focus on user accounts and endpoints, Service Principals often fall out of view—a blind spot that attackers deliberately exploit.
Source: www.it-daily.net · Published 24 July 2026
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