Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
1 January 2026
Week in brief
Attack surface reduction rules reference leads 14 Defender updates
Week of 29 December 2025 recorded 14 updated Microsoft Defender documentation changes. The most active areas were Endpoint, Cloud Apps, Identity.
- Attack surface reduction rules reference
Endpoint · Vulnerabilities and exposureUpdated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
- Attack Surface Reduction Rules ReferenceEndpoint · Vulnerabilities and exposure
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
- Enable attack surface reduction rulesEndpoint · Vulnerabilities and exposure
Updated Microsoft Defender documentation in defender-endpoint/enable-attack-surface-reduction.md.
- Whats New
Identity · Identity protectionUpdated Microsoft Defender documentation in defender-for-identity/whats-new.md.
- Caac Known Issues
Cloud Apps · Cloud and workloadsUpdated Microsoft Defender documentation in defender-for-cloud-apps/caac-known-issues.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
Microsoft Defender for Endpoint
7 updatesUpdated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
1 January 2026
Updated Microsoft Defender documentation in defender-endpoint/enable-attack-surface-reduction.md.
1 January 2026
Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.
1 January 2026
Edr Detection
UpdatedUpdated Microsoft Defender documentation in defender-endpoint/edr-detection.md.
1 January 2026
Updated Microsoft Defender documentation in defender-endpoint/respond-machine-alerts.md.
1 January 2026
Updated Microsoft Defender documentation in defender-endpoint/restore-quarantined-files-microsoft-defender-antivirus.md.
1 January 2026
Microsoft Defender for Identity
2 updatesWhats New
UpdatedUpdated Microsoft Defender documentation in defender-for-identity/whats-new.md.
1 January 2026
Whats New
UpdatedUpdated Microsoft Defender documentation in defender-for-identity/whats-new.md.
1 January 2026
Microsoft Defender for Cloud Apps
5 updatesCaac Known Issues
UpdatedUpdated Microsoft Defender documentation in defender-for-cloud-apps/caac-known-issues.md.
4 January 2026
Caac Known Issues
UpdatedUpdated Microsoft Defender documentation in defender-for-cloud-apps/caac-known-issues.md.
4 January 2026
Caac Known Issues
UpdatedUpdated Microsoft Defender documentation in defender-for-cloud-apps/caac-known-issues.md.
4 January 2026
Caac Known Issues
UpdatedUpdated Microsoft Defender documentation in defender-for-cloud-apps/caac-known-issues.md.
4 January 2026
Protect Asana
UpdatedUpdated Microsoft Defender documentation in defender-for-cloud-apps/protect-asana.md.
4 January 2026