# Microsoft Patches 398 Flaws Including a Windows Driver Zero-Day Under Active Attack

> **Open Intelligence Dossier** · First detected: 2026-08-12 03:07 UTC · Category: Technology

## Executive Summary
Microsoft's August Patch Tuesday delivers a massive deluge of updates addressing hundreds of flaws, including an exploited zero-day.

## Intelligence Brief
Recent coverage from outlets including computerworld.com, PCWorld, BleepingComputer, Check Point Research, Dark Reading, and SecurityWeek details the rollout of Microsoft's August Patch Tuesday updates. Among the substantial volume of patches is a Windows driver zero-day vulnerability identified as LegacyHive, which sources report is under active attack. Additionally, coverage highlights updates addressing Windows 10 Secure Boot certificates and research from Check Point Research concerning job offer-themed zero-day attacks. Reporting across these technology and security publications emphasizes the sheer scale of the August update deluge, characterizing the Patch Tuesday release as a monster event. Outlets such as SecurityWeek and Dark Reading focus on the massive count of Common Vulnerabilities and Exposures resolved by Microsoft, while BleepingComputer and computerworld.com specifically draw attention to the exploited Windows flaw and the LegacyHive zero-day vulnerability.


PCWorld's coverage centers on specific operating system components, noting how the Windows 10 patch maintains Secure Boot certificates. Meanwhile, Check Point Research contributes specific threat context with its analysis of attacks disguised as job offers. This flurry of updates arrives against the backdrop of continuous monthly security maintenance cycles by Microsoft, though the August deployment stands out for its exceptionally high volume of tracked CVEs and fixes. The presence of an actively exploited zero-day vulnerability within such a large batch of patches underscores the ongoing challenges software vendors face in securing complex operating systems against active threats. Coverage does not yet specify the full extent of the attacks leveraging the LegacyHive vulnerability, nor does it detail every individual target affected by the job offer-themed zero-day vector analyzed by researchers.


Future updates and security advisories from Microsoft and independent researchers will likely provide further clarity on the deployment success of these August patches. Readers and system administrators following the coverage should watch for subsequent technical analyses regarding the LegacyHive zero-day vulnerability and additional guidance on managing the massive volume of CVE fixes. Coverage does not yet specify whether secondary updates will be required to address installation issues stemming from the monster patch rollout, leaving administrators to monitor upcoming announcements from the reporting outlets.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| computerworld.com | August’s Patch Tuesday is a monster: 751 fixes, with an exploited Windows flaw | [Source Link](https://news.google.com/rss/articles/CBMiwwFBVV95cUxPcVE2UHoxbERjQk53OVpPajlvTjRhZkJWcVRiX0RQeVJZOXhfNmp0cFI2T3o2eHVyWmdSV2UtT2N0N3JxSkdHSjBVOWx4WTctTFljLWkydVJJX3BLRExIZi1WT3hJdnhjT0F6bWh5cmhsSzhwTVJxVW9tc2I1UDVzR3dIYk83RU1iS3AtVDg5ZkU0Vm9XRGZQWFJLWURJVHlNZFozNmVSTmVtellUbXg3TjdHZWsyQmQzT2FIVk5HbXNNMDA?oc=5) |
| PCWorld | Windows 10’s latest patch keeps your Secure Boot certificates on track | [Source Link](https://news.google.com/rss/articles/CBMitAFBVV95cUxOWmV5b2VxVEt6b0ZqSnhseUFJb1JDdi0zVEc3OVpWSWx6U2pNNnVJdl82el9OQ0Uyd1RaNVVnTkRPWHQzcmFUQ1R5WkJBMUZmeGZHbGlPMDc1UHJjSVhjU3BkYjVELW1hdEFYNWRBVndoUUQwWmZYUXZVZzRiN0VXUWZWSmIzTVhaMVA5cG4tcFg1eTlfRFFrdVZ3WWg0SUlqR003M0t3a1h2MXcxVHJIdEVHV2I?oc=5) |
| BleepingComputer | Microsoft patches LegacyHive Windows zero-day vulnerability | [Source Link](https://news.google.com/rss/articles/CBMirAFBVV95cUxONWhCSWlFc1ZFNnlWOXQ1ejN6SVpSLXpLQTB3X2RHREdtWXdYV0EwWFZCczl1S3UxWTMwcmQyVk9SeGdScFg3Q0RJRy1ieFladXAwenF5RTRfSlEyVVpQazhpUkNMQzdiTGFUaXJsSU1lTTAxUnRNdWtYMGNqUUtvbnNSWFpqWjhyUmhuYkhueDRqRjNoRWpIcWs1RWhKRGZyVXk4LVQ2Q0Z5eWdo0gGyAUFVX3lxTFB6VV9na3o5RGxjTnhRd1BIVnNCOG52Tkp0ekw2VHhMMmRMX08tRkJpZXBYVGJZU2oxWjFuVE1vbGRpSWl2MnR2OW9hVkpXWHExbDBTTzAwTGE0SnJDMmJ2bWZ3dU1MdzgwekN2ZVRWSktESlg3cDQ0NnlOZVN4eU00dlZBU24wWmlhZ2pjZjB1azlQcndLekZ3TWU3UlVHOGJqQWNNVzR) |
| Check Point Research | Shattering the Dream – When a Job Offer Becomes a Zero-Day Attack | [Source Link](https://news.google.com/rss/articles/CBMiowFBVV95cUxPVkFxRmNaMmtMUVZUQjEzV290Y0Y1dVdmN1NWc1E1d0JkNWQ4NjNTLUx1a2ljcUlkUk54TFlUT0NlVjJxN0tMSFQxS0dHMHkwVmM1emdYNUVSZHJESndQZTVPZVpDVWxLSEdSVWRxLWEyUFdaVEgtZldzYTZxUzdaR0J4cmkxVVVZZWhYTWE3RDB4WG9ObFU0WlBFR0g1a01DeFh3?oc=5) |
| Dark Reading | Microsoft's Patch Tuesday Deluge Continues With August Updates | [Source Link](https://news.google.com/rss/articles/CBMilAFBVV95cUxNV2VnODhIU3V2UHVUc1RlRVR6ZGdsOFhnMk9KM3hSNENaNi1Tc0F2TlBNNlpCQmpqMUtoRkd5UWNaZ2pDU1lJYWFoMzg2dTVSMEJmbkpMaXpybHZHdXZVQXVxemxrSXR6cEQ5OG9DblBVeWNnaW80LUNWU25zRWxLZHFNNWVyUFJka2toNjFNVGdvTjR4?oc=5) |
| SecurityWeek | August 2026 Patch Tuesday: Microsoft Fixes 421 CVEs, One Exploited Zero-Day | [Source Link](https://news.google.com/rss/articles/CBMipgFBVV95cUxNbkxGZ0d6dk1faTZmVEM0aEl3XzU2YWdOQXFpNzlraUQ5ckJHODVyNlJvNU5uOW5scmhOWkpXdU1UMkhPM2MxOExUNmJGSVJQMjlhcnEtY0FYM3RDUWVSVFRZQ3JfVG1yWFY1MlMyN0h4V0JIbU0yUmhkWnVINURDQjJOb1l2UU1lZVg1eG1Fbm1DcjdKdkZ6NXdrZVFyQzJZS0xRNnFR0gGrAUFVX3lxTE1SbVNoZTJQZnlZbjFUdTUwcHNpQ3JMYTh4djRTZVA0Qkp1M0dlTVJrdDl4RWk0ZnlwcExhY1BrNHRocGFfeWpFZHBQelZobFFEcHpIN3NzXzRORHJfS200RkJ5Tm9BeGlCTVZON2hKYmpmeUE4TEl1aFlRX2JFaEVMZTJmUktJTkZMRFNSWWQxSVBuUHB5SVUxa2F6UlJuOTlVZTBHZXI4RC1tVQ?) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-08-12/microsoft-patches-398-flaws-including-a-windows-driver-zero-day-under-active*