Windows 11 Update Causes Black Screen Issue for Users

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Windows 11 Update Causes Black Screen Issue for Users

First seen 28 Sep 2026, 15:06 UTC • •27.1

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ThreatCluster •September 28, 2026 at 15:07 UTC

•Windows 11 update causes black screen after sign-in for some users.
•Issue primarily affects Azure Virtual Desktop hosts using FSLogix.
•Microsoft has issued interim workarounds and a Known Issue Rollback.

A recent Windows 11 preview update released on August 27, 2026, has caused some devices to display a black screen after sign-in, primarily affecting Azure Virtual Desktop (AVD) hosts using FSLogix. Microsoft acknowledged the issue on September 24, 2026, and provided interim workarounds, including manually launching Explorer.exe through Task Manager. The problem appears to occur more frequently with existing user profiles and has been noted in the application event log as explorer.exe crashes. A Known Issue Rollback (KIR) has been issued to mitigate the issue temporarily, but it requires manual deployment for enterprise-managed devices. The black screen issue is part of a series of problems introduced by recent Windows updates, raising concerns about the overall quality of the operating system. Microsoft has not provided a timeline for a permanent fix.

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Timeline

2026-09-24

Microsoft acknowledges black screen issue

Microsoft disclosed that the August 27 preview update causes black screens after sign-in for some Windows 11 users.

2026-09-25

Workarounds published

Microsoft provided interim workarounds for affected users, including manually launching explorer.exe.

2026-09-28

Continued user issues reported

Users continue to experience issues with black screens following the update, prompting ongoing discussions about Windows update quality.

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Threat Graph

13 entities, 14 inferred relationships (STIX 2.1).

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Threat Actor (1)

ShinyHunters

Technique (3)

Phishing
Zero-day Exploit
T1566 - Phishing

Organization (1)

Microsoft

Malware (1)

Closedquorum

Affected Platform (5)

Azure Virtual Desktop
Citrix Profile Management
FSLogix
Windows
Windows 11

Tool (1)

Red Agent

Vulnerability (1)

NightmareEclipse

Relationships

ShinyHunters uses Closedquorum
ShinyHunters uses Red Agent
ShinyHunters uses Phishing
ShinyHunters uses Zero-day Exploit
ShinyHunters uses T1566 - Phishing
Closedquorum exploits NightmareEclipse
Red Agent exploits NightmareEclipse
NightmareEclipse targets Azure Virtual Desktop
NightmareEclipse targets Citrix Profile Management
NightmareEclipse targets FSLogix
NightmareEclipse targets Windows
ShinyHunters targets Microsoft
Closedquorum targets Microsoft
ShinyHunters related to Windows 11

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