Windows update intelligence
KB5066835
October security update · 2025-10-14
Curated snapshot · 2026-10-25. This small collection is not a complete risk assessment. No matching report does not mean an update is safe. Automatic monitoring is not connected.
Update identity
- Windows versions
- 24H2 / 25H2
- OS builds
- 26100.6899 / 26200.6899
- Release type
- Security
- Released
- 2025-10-14
- Last checked
- 2026-10-25
Issues & evidence
2 resultsUSB mouse and keyboard unresponsive in Windows Recovery Environment
USB mice and keyboards may not work inside the Windows Recovery Environment after the October 2025 security update.
Smartcard authentication issues after the October 2025 update
A security change strengthening Windows Cryptographic Services caused smartcard authentication issues for some configurations.
Resolution links
No resolving links captured in this collection.
An update that supersedes another update does not automatically resolve every associated issue.