An October 2025 Microsoft Home windows security replace is wreaking havoc on enterprises, impacting a number of techniques with bugs starting from annoying to showstopper.
The replace in KB5066835 was supposed to strengthen Home windows cryptography, by transferring from the older Cryptographic Companies Supplier (CSP) to the safer Key Storage Supplier (KSP), however customers could now be experiencing points with authentication, web sites, updates, and even use of mice and keyboards.
These and different identified points impression Home windows variations designated for broad deployment, together with Home windows 10 (model 22H2), Home windows 11 (variations 23H2, 24H2, and 25H2), and Home windows Server (2012, 2016, 2022, and 2025 releases).
