Microsoft Defender for Endpoint
Endpoint protectionMicrosoft Defender Endpoint Releases
In brief
The page now lists Windows Antivirus platform 4.18.26100.4, engine 1.1.26100.4, and security intelligence 1.463.1.0, released October 27, 2026. It documents lower CPU usage after full scans, recognition of security-settings-managed devices, and completed Clipboard Protection rollout.
What Defender admins need to know
Administrators can use the version details to track deployment and review the documented behavior changes. No administrator action is specified.
Summaries are generated from the documentation change itself.
Documentation change
View on Microsoft LearnThe comparison below shows only the changed extract. Use the full-page view for complete context.
| OS | Build | Month released | Details | Learn more |
|---|---|---|---|---|
| Platform 4.18.26100.4 / Engine 1.1. |
- |
Release details and updates | ||
| macOS | 101.26092.0009 | October 2026 | - Release version: 20.126092.9.0- Engine version: 1.1.26060.12000- Signature version: 1.453.151.0 | Release details and updates |
| Linux | 101.26091.0004 | October 2026 | - Release version: 30.126091.0004.0- Engine version: 1.1.26070.5001- Signature version: 1.457.364.0 | Release details and updates |
| Android | 1.0.9406.0102 | Oct 2026 | - Build: 1.0.9406.0102- Release: Oct 23, 2026 | Release details and updates |
For more information about Microsoft Defender Antivirus updates, see Microsoft Defender Antivirus security intelligence product updates and support.
Windows Antivirus | October 2026 | Platform 4.18.26100.4 | Engine 1.1.26100.4
Release details
| Component | Version | Date |
|---|---|---|
| Platform | 4.18.26100.4 | October 27, 2026 |
| Engine | 1.1.26100.4 | October 27, 2026 |
| Security intelligence^1^ | 1.463.1.0 | October 27, 2026 |
| Support phase | Security and Critical Updates | - |
^1^The security intelligence version listed here is relevant to the listed engine release. Newer versions of security intelligence are released regularly. For more information, see Security intelligence updates for Microsoft Defender Antivirus and other Microsoft anti-malware.
Enhancements and features
- Reduced CPU usage after full scans by avoiding repeated decompression of Windows image archives (WIM).
- Recognize devices configured using Defender for Endpoint security settings management as managed devices.
- Completed rollout of Microsoft Defender Clipboard Protection- DefenderSessionHelper.exe.
Windows Antivirus | September 2026 | Platform 4.18.26090.9 | Engine 1.1.26090.9
Release details
@@ -34,12 +34,12 @@ item_type: Content source_path: defender-endpoint/microsoft-defender-endpoint-releases.md cmProducts: - https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/8b9ae643-2e85-42b8-beb2-eef4bae8c4bc-- https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/19ec6774-09b8-473e-a17e-b17b518bbad7 - https://authoring-docs-microsoft.poolparty.biz/devrel/bcbcbad5-4208-4783-8035-8481272c98b8+- https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/19ec6774-09b8-473e-a17e-b17b518bbad7 spProducts: - https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/e047e27d-b5f3-43a8-b4b0-4f6dca95e7c9-- https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/ade36b61-c646-4bd8-87ee-f3a843461962 - https://authoring-docs-microsoft.poolparty.biz/devrel/43b2e5aa-8a6d-4de2-a252-692232e5edc8+- https://microsoft-devrel.poolparty.biz/DevRelOfferingOntology/ade36b61-c646-4bd8-87ee-f3a843461962 platformId: 489b2a93-728e-0a40-5b05-d494dd07e66f --- @@ -59,7 +59,7 @@ This table includes supported releases for all supported platforms in the past s
| OS | Build | Month released | Details | Learn more |
| --- | --- | --- | --- | --- |
-| iOS | 1.1.82230103 | Oct 2026 | - Build: 1.1.82230103- Release: Oct 24, 2026 | Release details and updates |
+| Windows Antivirus | Platform 4.18.26100.4 / Engine 1.1.26100.4 | October 2026 | - Platform: 4.18.26100.4- Engine: 1.1.26100.4- Security intelligence: 1.463.1.0 | Release details and updates |
| macOS | 101.26092.0009 | October 2026 | - Release version: 20.126092.9.0- Engine version: 1.1.26060.12000- Signature version: 1.453.151.0 | Release details and updates |
| Linux | 101.26091.0004 | October 2026 | - Release version: 30.126091.0004.0- Engine version: 1.1.26070.5001- Signature version: 1.457.364.0 | Release details and updates |
| Android | 1.0.9406.0102 | Oct 2026 | - Build: 1.0.9406.0102- Release: Oct 23, 2026 | Release details and updates |
@@ -1563,6 +1563,25 @@ For the latest UX improvements, see [iOS UX improvements](ios-new-ux).
For more information about Microsoft Defender Antivirus updates, see [Microsoft Defender Antivirus security intelligence product updates and support](microsoft-defender-antivirus-updates).
+### Windows Antivirus | October 2026 | Platform 4.18.26100.4 | Engine 1.1.26100.4
+
+#### Release details
+
+| Component | Version | Date |
+| --- | --- | --- |
+| Platform | 4.18.26100.4 | October 27, 2026 |
+| Engine | 1.1.26100.4 | October 27, 2026 |
+| Security intelligence^1^ | 1.463.1.0 | October 27, 2026 |
+| Support phase | Security and Critical Updates | - |
+
+^1^The security intelligence version listed here is relevant to the listed engine release. Newer versions of security intelligence are released regularly. For more information, see [Security intelligence updates for Microsoft Defender Antivirus and other Microsoft anti-malware](https://www.microsoft.com/wdsi/defenderupdates).
+
+### Enhancements and features
+
+- Reduced CPU usage after full scans by avoiding repeated decompression of Windows image archives (WIM).
+- Recognize devices configured using Defender for Endpoint security settings management as managed devices.
+- Completed rollout of Microsoft Defender Clipboard Protection- DefenderSessionHelper.exe.
+
### Windows Antivirus | September 2026 | Platform 4.18.26090.9 | Engine 1.1.26090.9
#### Release details