Week in brief

Risk evaluation framework changelog leads 303 Defender updates

Week of 25 May 2026 recorded 5 new, 294 updated, 2 removed Microsoft Defender documentation changes and 2 relevant Message Center announcements. The most active areas were Endpoint, Defender XDR, Identity.

  • Exposure Management · Vulnerabilities and exposure
    Risk evaluation framework changelog

    Added Microsoft Defender documentation in exposure-management/risk-evaluation-changelog.md.

  • Defender XDR · Hunting and detection
    Advanced Hunting Security Copilot

    Updated Microsoft Defender documentation in defender-xdr/advanced-hunting-security-copilot.md.

  • Sentinel · Cloud and workloads
    Siem Migration

    Updated Microsoft Defender documentation in sentinel/siem-migration.md.

  • Vulnerability Management · General
    Fixed Reported Inaccuracies

    Updated Microsoft Defender documentation in defender-vulnerability-management/fixed-reported-inaccuracies.md.

  • Identity · Identity protection
    Migrate To Sensor V3

    Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

For Defender administrators

Review the linked Microsoft Learn changes that apply to your managed platforms, policies, applications, and rollout plans. The archive preserves the source diff for verification.

This period briefing was assembled from the tracked Microsoft Learn and Message Center changes.

Updates this week

30

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

31 May 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

31 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

28 May 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

28 May 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

28 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

28 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

28 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

28 May 2026

Teams Restrictions Dexapp

Updated

Updated Microsoft Defender documentation in defender-xdr/teams-restrictions-dexapp.md.

28 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

27 May 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

27 May 2026

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

27 May 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

27 May 2026

Security Analyst Agent

Updated

Updated Microsoft Defender documentation in defender-xdr/security-analyst-agent.md.

26 May 2026

Investigate Alerts

Updated

Updated Microsoft Defender documentation in defender-xdr/investigate-alerts.md.

26 May 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

25 May 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

25 May 2026

Defender Security For Ai

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/defender-security-for-ai.md.

25 May 2026

Ai Agent Inventory

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-inventory.md.

25 May 2026

CloudProcessEvents (Preview)

Updated

Updated Microsoft Defender documentation in defender-xdr/advanced-hunting-cloudprocessevents-table.md.

25 May 2026

MessageEvents

Updated

Updated Microsoft Defender documentation in defender-xdr/advanced-hunting-messageevents-table.md.

25 May 2026

MessagePostDeliveryEvents

Updated

Updated Microsoft Defender documentation in defender-xdr/advanced-hunting-messagepostdeliveryevents-table.md.

25 May 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

25 May 2026
12
4

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

27 May 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

25 May 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

25 May 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

25 May 2026
2
2

Whats New

Updated

Updated Microsoft Defender documentation in defender-xdr/whats-new.md.

25 May 2026
1
1

Ai Agent Detection Protection

Updated

Updated Microsoft Defender documentation in defender-xdr/security-for-ai/ai-agent-detection-protection.md.

25 May 2026
1

Session Cookie Theft Alert

Updated

Updated Microsoft Defender documentation in defender-xdr/session-cookie-theft-alert.md.

29 May 2026
120

Configure Endpoints Script

Updated

Updated Microsoft Defender documentation in defender-endpoint/configure-endpoints-script.md.

29 May 2026

Android Configure Mam

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure-mam.md.

29 May 2026

Android Configure

Updated

Updated Microsoft Defender documentation in defender-endpoint/android-configure.md.

29 May 2026

Discover Local Ai Agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

28 May 2026

Protect Ai Agents Overview

Updated

Updated Microsoft Defender documentation in defender-endpoint/protect-ai-agents-overview.md.

27 May 2026

Data Storage Privacy

Updated

Updated Microsoft Defender documentation in defender-endpoint/data-storage-privacy.md.

27 May 2026

Discover Local Ai Agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

27 May 2026

Endpoint Detection Response

Updated

Updated Microsoft Defender documentation in defender-endpoint/overview-endpoint-detection-response.md.

27 May 2026

Protect Ai Agents Overview

Updated

Updated Microsoft Defender documentation in defender-endpoint/protect-ai-agents-overview.md.

27 May 2026

Discover Local Ai Agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Linux Preferences

Updated

Updated Microsoft Defender documentation in defender-endpoint/linux-preferences.md.

25 May 2026

Discover local AI agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Discover local AI agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Discover Local Ai Agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Minimum Requirements

Updated

Updated Microsoft Defender documentation in defender-endpoint/minimum-requirements.md.

25 May 2026

Protect Ai Agents Overview

Updated

Updated Microsoft Defender documentation in defender-endpoint/protect-ai-agents-overview.md.

25 May 2026

Deployment Strategy

Updated

Updated Microsoft Defender documentation in defender-endpoint/deployment-strategy.md.

25 May 2026

Deployment Strategy

Updated

Updated Microsoft Defender documentation in defender-endpoint/deployment-strategy.md.

25 May 2026

Discover local AI agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Discover Local Ai Agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026

Minimum Requirements

Updated

Updated Microsoft Defender documentation in defender-endpoint/minimum-requirements.md.

25 May 2026
8

Onboard Downlevel

Updated

Updated Microsoft Defender documentation in defender-endpoint/onboard-downlevel.md.

28 May 2026

Onboard Downlevel

Updated

Updated Microsoft Defender documentation in defender-endpoint/onboard-downlevel.md.

28 May 2026

Onboard Downlevel

Updated

Updated Microsoft Defender documentation in defender-endpoint/onboard-downlevel.md.

28 May 2026

Onboard Downlevel

Updated

Updated Microsoft Defender documentation in defender-endpoint/onboard-downlevel.md.

25 May 2026
7

Protect Ai Agents Overview

Updated

Updated Microsoft Defender documentation in defender-endpoint/protect-ai-agents-overview.md.

28 May 2026

Microsoft Defender Endpoint

Updated

Updated Microsoft Defender documentation in defender-endpoint/microsoft-defender-endpoint.md.

27 May 2026

Protect Ai Agents Overview

Updated

Updated Microsoft Defender documentation in defender-endpoint/protect-ai-agents-overview.md.

25 May 2026

Discover local AI agents

Updated

Updated Microsoft Defender documentation in defender-endpoint/discover-local-ai-agents.md.

25 May 2026
1
29

Scc Permissions

Updated

Updated Microsoft Defender documentation in defender-office-365/scc-permissions.md.

30 May 2026

Email Authentication About

Updated

Updated Microsoft Defender documentation in defender-office-365/email-authentication-about.md.

29 May 2026

Air About

Updated

Updated Microsoft Defender documentation in defender-office-365/air-about.md.

29 May 2026

Anti Spam Policies Configure

Updated

Updated Microsoft Defender documentation in defender-office-365/anti-spam-policies-configure.md.

29 May 2026

Scc Permissions

Updated

Updated Microsoft Defender documentation in defender-office-365/scc-permissions.md.

29 May 2026

Submissions Admin

Updated

Updated Microsoft Defender documentation in defender-office-365/submissions-admin.md.

29 May 2026

Zero Hour Auto Purge

Updated

Updated Microsoft Defender documentation in defender-office-365/zero-hour-auto-purge.md.

29 May 2026

Air Auto Remediation

Updated

Updated Microsoft Defender documentation in defender-office-365/air-auto-remediation.md.

29 May 2026

Configure trusted ARC sealers

Updated

Updated Microsoft Defender documentation in defender-office-365/email-authentication-arc-configure.md.

28 May 2026

Submissions Teams

Updated

Updated Microsoft Defender documentation in defender-office-365/submissions-teams.md.

27 May 2026

Submissions Admin

Updated

Updated Microsoft Defender documentation in defender-office-365/submissions-admin.md.

27 May 2026
4
2
32

Migrate To Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

28 May 2026

Migrate To Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

28 May 2026

Migrate To Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

28 May 2026

Migrate To Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

28 May 2026

Health Alerts

Updated

Updated Microsoft Defender documentation in defender-for-identity/health-alerts.md.

28 May 2026

Health Alerts

Updated

Updated Microsoft Defender documentation in defender-for-identity/health-alerts.md.

28 May 2026

Health Alerts

Updated

Updated Microsoft Defender documentation in defender-for-identity/health-alerts.md.

28 May 2026

Health Alerts

Updated

Updated Microsoft Defender documentation in defender-for-identity/health-alerts.md.

28 May 2026

Migrate To Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/migrate-to-sensor-v3.md.

27 May 2026

Alerts Xdr

Updated

Updated Microsoft Defender documentation in defender-for-identity/alerts-xdr.md.

26 May 2026

Directory Service Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/directory-service-accounts.md.

26 May 2026

Manage Action Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/manage-action-accounts.md.

26 May 2026

Remediation Actions

Updated

Updated Microsoft Defender documentation in defender-for-identity/remediation-actions.md.

26 May 2026

Whats New

Updated

Updated Microsoft Defender documentation in defender-for-identity/whats-new.md.

26 May 2026

Remediation Actions

Updated

Updated Microsoft Defender documentation in defender-for-identity/remediation-actions.md.

25 May 2026

Manage Action Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/manage-action-accounts.md.

25 May 2026

Manage Action Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/manage-action-accounts.md.

25 May 2026

Remediation Actions

Updated

Updated Microsoft Defender documentation in defender-for-identity/remediation-actions.md.

25 May 2026

Directory Service Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/directory-service-accounts.md.

25 May 2026

Manage Action Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/manage-action-accounts.md.

25 May 2026

Manage Action Accounts

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/manage-action-accounts.md.

25 May 2026

Prerequisites Sensor Version 2

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/prerequisites-sensor-version-2.md.

25 May 2026

Remediation Actions

Updated

Updated Microsoft Defender documentation in defender-for-identity/remediation-actions.md.

25 May 2026

Remediation Actions

Updated

Updated Microsoft Defender documentation in defender-for-identity/remediation-actions.md.

25 May 2026
17

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

28 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

28 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

28 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

28 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

26 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

26 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

25 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

25 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

25 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

25 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

25 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

25 May 2026

Deploy Defender Identity

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-defender-identity.md.

25 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

25 May 2026

Deploy Sensor V3

Updated

Updated Microsoft Defender documentation in defender-for-identity/deploy/deploy-sensor-v3.md.

25 May 2026
1

Mde Govern

Updated

Updated Microsoft Defender documentation in defender-for-cloud-apps/mde-govern.md.

25 May 2026
16

Ueba Reference

Updated

Updated Microsoft Defender documentation in sentinel/ueba-reference.md.

28 May 2026

Siem Migration

Updated

Updated Microsoft Defender documentation in sentinel/siem-migration.md.

27 May 2026

Billing

Updated

Updated Microsoft Defender documentation in sentinel/billing.md.

27 May 2026
1
3

Risk Evaluation Changelog

Updated

Updated Microsoft Defender documentation in exposure-management/risk-evaluation-changelog.md.

27 May 2026
1

Fixed Reported Inaccuracies

Updated

Updated Microsoft Defender documentation in defender-vulnerability-management/fixed-reported-inaccuracies.md.

27 May 2026
6

Mto Tenant Groups

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-tenant-groups.md.

27 May 2026

Mto Tenant Groups

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-tenant-groups.md.

27 May 2026

Mto Tenant Groups

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-tenant-groups.md.

27 May 2026

Mto Tenant Groups

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-tenant-groups.md.

27 May 2026

Mto Tenant Groups

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-tenant-groups.md.

27 May 2026
2

Mto Overview

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-overview.md.

27 May 2026

Mto Overview

Updated

Updated Microsoft Defender documentation in unified-secops-platform/mto-overview.md.

27 May 2026