MICROSOFT SECURITY UPDATES BREAKS MSMQ ON OLDER WIN SYSTEMS

Summary from the TLDR InfoSec newsletter

Microsoft acknowledges that December 2025 security updates have broken Microsoft Message Queuing on some older Windows 10 and Windows Server systems, causing inactive queues. The root cause is tightened NTFS permissions on the MSMQ storage folder, which now block required write access for MSMQ users. Only older, mostly enterprise systems are affected. There is no proper fix beyond workarounds or uninstalling the update.