Update Alert: Windows 11 KB5089549 Triggers Widespread Network Degradation and Installation Failures
ID: 334feeeb-c04b-5d93-b398-e55f774c6e5b
STIX ID: report--334feeeb-c04b-5d93-b398-e55f774c6e5b
Feed Name: securityonline.info
This report describes post-deployment problems with Windows 11 cumulative update KB5089549 (25H2): numerous installation failures and reports from enterprise IT administrators of sustained network performance degradation following the update (issues reportedly persist even after uninstall). Microsoft has not yet publicly responded; affected administrators are encouraged to submit formal feedback via Microsoft channels.
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