October 14, 2025—KB5066837 (OS Build 10240.21161)

October 14, 2025—KB5066837 OS Build 10240.21161 Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices for the...

October 14, 2025—KB5066793 (OS Builds 22621.6060 and 22631.6060)

October 14, 2025—KB5066793 OS Builds 22621.6060 and 22631.6060 Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business...

Trick, treat, repeat

Welcome to this week's edition of the Threat Source newsletter. This one is pretty much an updated, Halloween-themed version of my newsletter from July, including data up through Q3. October 14th has passed, so free support for Windows 10 has come to an end, leaving you with no more fixes unless...

September 23, 2025—KB5065790 (OS Build 22631.5984) Preview

September 23, 2025—KB5065790 OS Build 22631.5984 Preview Windows Secure Boot certificate expirationImportant: Secure Boot certificates used by most Windows devices are set to expire starting in June 2026. Microsoft has been updating these certificates on consumer and non-managed business devices...

A week in security (September 1 – September 7)

Last week on Malwarebytes Labs: Nexar dashcam video database hacked Roblox introduces age checks to use communication features Give your PC a fresh start: New free tools to boost your PC’s speed, security, and peace of mind TP-Link warns of botnet infecting routers and targeting Microsoft 365...