Thursday, 1 January 2026

Attack surface reduction rules reference leads 9 Defender updates

1 January 2026 recorded 9 updated Microsoft Defender documentation changes. The most active areas were Endpoint, Identity.

• Endpoint · Vulnerabilities and exposure

  Attack surface reduction rules reference

  Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.

• Endpoint · Vulnerabilities and exposure

  Attack Surface Reduction Rules Reference

  Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.

• Endpoint · Vulnerabilities and exposure

  Enable attack surface reduction rules

  Updated Microsoft Defender documentation in defender-endpoint/enable-attack-surface-reduction.md.

• Endpoint · Vulnerabilities and exposure

  Attack Surface Reduction Rules Reference

  Updated Microsoft Defender documentation in defender-endpoint/attack-surface-reduction-rules-reference.md.

• Identity · Identity protection

  Whats New

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

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