Update alert


The improved Microsoft 365 security center is now available in public preview. This new experience brings Defender for Endpoint, Defender for Office 365, Microsoft 365 Defender, and more into the Microsoft 365 security center. Learn what's new. This topic might apply to both Microsoft Defender for Endpoint and Microsoft 365 Defender. Refer to the Applies To section and look for specific call outs in this article where there might be differences.

Applies to:

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If you are a US Government customer, please use the URIs listed in Microsoft Defender for Endpoint for US Government customers.


For better performance, you can use server closer to your geo location:

  • api-us.securitycenter.microsoft.com
  • api-eu.securitycenter.microsoft.com
  • api-uk.securitycenter.microsoft.com

API description

Updates properties of existing Alert.
Submission of comment is available with or without updating properties.
Updatable properties are: status, determination, classification and assignedTo.


  1. You can update alerts that available in the API. See List Alerts for more information.
  2. Rate limitations for this API are 100 calls per minute and 1500 calls per hour.


One of the following permissions is required to call this API. To learn more, including how to choose permissions, see Use Microsoft Defender for Endpoint APIs

Permission type Permission Permission display name
Application Alerts.ReadWrite.All 'Read and write all alerts'
Delegated (work or school account) Alert.ReadWrite 'Read and write alerts'


When obtaining a token using user credentials:

  • The user needs to have at least the following role permission: 'Alerts investigation' (See Create and manage roles for more information)
  • The user needs to have access to the device associated with the alert, based on device group settings (See Create and manage device groups for more information)

HTTP request

PATCH /api/alerts/{id}

Request headers

Name Type Description
Authorization String Bearer {token}. Required.
Content-Type String application/json. Required.

Request body

In the request body, supply the values for the relevant fields that should be updated.
Existing properties that are not included in the request body will maintain their previous values or be recalculated based on changes to other property values.
For best performance you shouldn't include existing values that haven't change.

Property Type Description
status String Specifies the current status of the alert. The property values are: 'New', 'InProgress' and 'Resolved'.
assignedTo String Owner of the alert
classification String Specifies the specification of the alert. The property values are: 'Unknown', 'FalsePositive', 'TruePositive'.
determination String Specifies the determination of the alert. The property values are: 'NotAvailable', 'Apt', 'Malware', 'SecurityPersonnel', 'SecurityTesting', 'UnwantedSoftware', 'Other'
comment String Comment to be added to the alert.


If successful, this method returns 200 OK, and the alert entity in the response body with the updated properties. If alert with the specified id was not found - 404 Not Found.



Here is an example of the request.

PATCH https://api.securitycenter.microsoft.com/api/alerts/121688558380765161_2136280442
    "status": "Resolved",
	"assignedTo": "secop2@contoso.com",
    "classification": "FalsePositive",
    "determination": "Malware",
    "comment": "Resolve my alert and assign to secop2"