Oct 20, 2025 · Microsoft says the October 2025 Windows security updates are causing smart card authentication and certificate issues due to a change designed to strengthen the Windows...

Oct 17, 2025 · Per Microsoft: After installing the October 2025 Windows security update (KB5066835), released October 14, 2025, users might encounter smart card authentication …

Oct 21, 2025 · Microsoft has published a fix and a temporary workaround for a smart‑card authentication regression introduced by October’s cumulative updates, but the repair requires …

Oct 20, 2025 · The good news is that there are clear steps you can take to identify if you are affected and a specific workaround to restore your smart card’s functionality. This guide will …

Oct 23, 2025 · Microsoft accidentally broke several things in the October 2025 Windows Update, but smart card authentication was not one of them. That was intentionally broken, and the …

On October 17, 2025, Microsoft published the support article Smartcard authentication issues might occur with the October 2025 Windows update in the Known Issues section for various …

Microsoft has confirmed that the October 2025 Windows security update has inadvertently caused major authentication issues across Windows 10, Windows 11, and Windows Server systems.

Oct 19, 2025 · Enterprises using smart cards for logins and digital signatures encountered widespread failures after installing KB5066835. Reported issues included smart cards not …

Unfortunately, in the Windows Update of October 14, 2025, Microsoft changed this strategy and certificates from cards are registered with an indication of the “more modern” standard of the …

Oct 22, 2025 · Smart card authentication and other certificate operations might intentionally fail after installing Windows Updates released on or after October 14, 2025 (KB5066835) that …