October

Winsage
October 18, 2026
Microsoft Windows Production PCA 2011, the certificate for signing the Windows boot loader, will expire on October 19, 2026. This follows the earlier expiration of two other 2011 certificates in June 2026. PCs without the new certificates will still boot and receive standard updates but will miss out on new security enhancements for the early boot process. The new certificates from 2023 are replacing the 2011 certificates. The KEK certificate, essential for authorizing updates to signature databases, and the Microsoft UEFI CA 2011, which signs third-party boot loaders, will also be replaced by new certificates. Users can check their Secure Boot status through the System Information tool or Windows Security. Microsoft is gradually rolling out the new Secure Boot certificates through Windows Update, and users are advised not to disable Secure Boot to avoid complications. Dell will not issue BIOS updates for platforms that reached their end of service life before January 1, 2026. The transition to Secure Boot has faced challenges for older PCs, and developers are advised against pinning Secure Boot certificates in their applications. Multiple restarts may be required for full integration of the new certificates.
Winsage
October 17, 2026
Windows 11 has introduced an "accelerated app launch" feature, initially benefiting Microsoft Edge. This feature allows Windows to open Edge more quickly by routing requests directly to the existing instance of the app instead of starting a new temporary process. The update, KB5127936, was rolled out to Windows Insiders on October 16, 2026, and is part of updates for Windows 11 25H2 and 26H2. The enhancement primarily improves the launch speed of Edge when it is already running in the background, particularly benefiting warm launches. Testing showed that Edge launched faster when other applications were active post-update. Microsoft aims to extend this feature to other single-instance applications, but it requires developers to meet specific prerequisites and request access to certain APIs. The accelerated launch feature is expected to be available as an optional update around November 10, 2026.
Winsage
October 17, 2026
On October 13, 2026, Microsoft released security updates for Windows Server that unintentionally affected Microsoft Exchange Server, causing significant disruptions approximately 24 hours after installation. Users reported issues such as database services failing, resulting in unresponsive email and Outlook Web Access access. Microsoft acknowledged the problem and is investigating it. The updates targeted supported Windows Server and Microsoft Exchange versions 2016, 2019, and SE. By October 15, reports of severe issues, including the inability to connect to the server and halted email delivery, emerged. The error message associated with the disruption is "MapiExceptionMdbOffline: Unable to make connection to the server. (hr=0x80004005, ec=1142)." Despite these issues, the Exchange Admin Center still showed databases as connected and mounted. Unofficial workarounds, including a registry edit and a PowerShell script, have been suggested to mitigate the problems.
Winsage
October 16, 2026
The Windows security update scheduled for October 2026 will block requests using the outdated NTLMv1 security protocol. The BlockNtlmSSO registry value governs this change; if unset, Windows will default to Enforce mode, blocking NTLMv1-derived credentials. Administrators can temporarily set this value to 0 to allow NTLMv1, but Microsoft warns this reduces security. The deprecation of NTLM was first announced in 2024, with audit logs for NTLMv1 usage introduced in August 2025. NTLM was first introduced in 1993, and while it has been removed from Windows 11 24H2 and Windows Server 2025, traces remain in certain configurations. Credential Guard must be enabled, and the BlockNtlmSSO value must not be set to Audit mode for NTLMv1-derived credentials to be allowed. Microsoft aims to eliminate NTLM entirely, and the upcoming update signals the need for organizations to accelerate their transition away from NTLMv1.
Tech Optimizer
October 16, 2026
AV-Comparatives evaluated 20 consumer security products against 10,000 malware samples, focusing on the x47.c botnet, which emerged in October 2026 and is marketed by WraithTools. This botnet can steal sensitive information and turn infected devices into proxies for cybercriminals. Research indicates it can extract passwords, cookies, and data from AI service accounts. The U.S. Department of Justice noted the risk to freelancers and small businesses from such threats. In its September 2026 Malware Protection Test, AV-Comparatives found that 15 out of 20 products reached the highest protection tier, with six receiving the ADVANCED+ award: Bitdefender, ESET, G DATA, Kaspersky, Total Defense, and VIPRE. The testing revealed a reliance on cloud-based detection, emphasizing the need for consistent internet connectivity for optimal protection.
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