Updated last night, no issues immediately visible.

Users this morning all have login prompts to access mapped drives/folder redirections.

No creds working.

I can log in locally as a Domain Admin, but trying to open DNS console or run any DNS powershell commands just gives me Access Denied.

DNS still resolves, and the domain services are all still running, but something has happened with authentication/permissions.

Currently rolling back KB5122882 in the hope it was that.

Anyone else issues this morning?

EDIT: https://www.rapid7.com/db/vulnerabilities/cve-2026-69813/

Looks like this KB might have touched DNS code - roll back in progress.

EDIT2 & Fix: Rolled back the KB but the issue persisted - ended up resetting the DC's secure channel to itself which resolved the issue fully. The issue happened at exactly the moment at which the update was installed last night - either the update did indeed cause the issue which persisted in being broken even once rolled back, or it's a heck of a coincidence.

Active Directory Certificate Services (AD CS) Elevation of Privilege Vulnerability

Microsoft Windows Media Foundation Remote Code Execution Vulnerability

Use after free in Windows VHD miniport driver allows an authorized attacker to elevate privileges locally.

Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.

Improper limitation of a pathname to a restricted directory ('path traversal') in Windows PowerShell allows an unauthorized attacker to bypass a security feature over a network.

Use after free in Windows Push Notifications allows an authorized attacker to elevate privileges locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

Null pointer dereference in Active Directory Domain Services allows an authorized attacker to deny service over a network.

Use after free in Windows Server allows an authorized attacker to elevate privileges locally.

Authentication bypass by spoofing in Windows Netlogon allows an unauthorized attacker to perform spoofing over an adjacent network.

Use after free in Active Directory Domain Services allows an authorized attacker to execute code over a network.

Heap-based buffer overflow in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Connected User Experiences and Telemetry allows an authorized attacker to elevate privileges locally.

Microsoft Office Word Information Disclosure Vulnerability

Heap-based buffer overflow in Windows USB Mass Storage Class Driver allows an unauthorized attacker to execute code over a network.

Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

Heap-based buffer overflow in Windows Storage Spaces Controller allows an authorized attacker to execute code locally.

Integer underflow (wrap or wraparound) in Windows GDI+ allows an authorized attacker to elevate privileges over a network.

Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

Improper link resolution before file access ('link following') in Windows Universal Plug and Play (UPnP) Device Host allows an authorized attacker to disclose information locally.

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows USB Driver allows an authorized attacker to elevate privileges locally.

Files or directories accessible to external parties in Windows Defender Firewall Service allows an authorized attacker to disclose information locally.

Use after free in Windows Print Spooler Components allows an authorized attacker to elevate privileges over a network.

Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

Integer overflow or wraparound in Windows NTFS allows an authorized attacker to elevate privileges locally.

Heap-based buffer overflow in Windows NTFS allows an unauthorized attacker to execute code with a physical attack.

Use after free in Windows Kernel allows an authorized attacker to elevate privileges over a network.

Buffer over-read in Windows NTFS allows an authorized attacker to disclose information locally.