OneDrive endpoints are the Microsoft Graph API routes used to access OneDrive content, such as creating, reading, updating, moving, or deleting files and folders. They are part of the normal cloud application interface, so they can be used by legitimate apps, automation tools, and user workflows.
In cyber security, these endpoints matter because attackers can abuse them as a covert control or data-transfer channel. Malicious software may use authenticated API calls to upload payloads, fetch instructions, or stage stolen files while blending into ordinary Microsoft 365 traffic. Defenders should watch for unusual OAuth consent, abnormal file-operation patterns, repeated access from unfamiliar devices, and requests that do not match the user’s normal behavior. Monitoring identity, app permissions, and API telemetry is often more effective than relying only on network filtering, because the traffic is sent to a trusted cloud service.