Microsoft security update breaks MSMQ on older Win systems
ID: ebe4f73d-7787-5b98-ada8-63e791955391
STIX ID: report--ebe4f73d-7787-5b98-ada8-63e791955391
Feed Name: The Register (Security)
Microsoft confirmed the December 2025 Security Update can break MSMQ on Windows 10 (22H2 and earlier) and Windows Server 2012–2019 by changing NTFS permissions on C:\Windows\System32\MSMQ\storage, causing inactive queues, IIS errors about insufficient resources, and failed writes—especially under clustered load; enterprises are most affected, and while uninstalling the update may restore functionality, it removes security fixes, with Microsoft advising affected admins to contact support for a workaround.
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