[German]Samsung has apparently been rolling out the April 2026 Android security update for several days now. A reader pointed out to me that there are serious issues with Microsoft 365 apps on Android once the update is installed. Microsoft Teams and the Authenticator no longer work. Other Microsoft 365 apps are reportedly affected as well. Disabling the Private DNS option is said to help.
[German]The Microsoft Teams desktop client has been experiencing a bug on both macOS and Windows since the update to build 26072.519.4556.7438 was rolled out. The issue is that right-clicking no longer works in the desktop client. Clipboard operations may need to be performed using the keyboard shortcuts Ctrl+C, Ctrl+X, and Ctrl+V.
In a support post on the Windows Release Health Dashboard for Windows Server 2025, Microsoft has confirmed installation issues with updates. Updates installed via the standalone WUSA program may fail if they are located in a shared folder. This issue has existed since June 2025. More details may be read at my German blog post here [use build-in translator to switch language].
The cumulative security updates released for Windows on April 14, 2024, address several issues. Microsoft has now confirmed that these updates may cause Windows Server 2019 and Windows Server 2022 to be unintentionally upgraded to Windows Server 2025. However, the issue is reportedly resolved. More Details may be found within my German blog post here [use build-in translation to switch language].
[German]The cumulative security updates released for Windows on April 14, 2024, are causing some issues. I have received several user reports indicating that users are unable to log in after installing the April 2026 updates. This affects Windows Server, but likely also Windows 11 clients (though that may be a different issue).
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Microsoft updated the Media Creation Tool (MCT), version 10.0.26100.7019, on April 17, 2026, regarding the downloaded installation images. When creating a USB installation medium, Windows 11 25H2 Build 26200.8246 is now downloaded. This build includes the security update KB5083769 from April 14, 2026. (via)
[German]The security update KB5082063, released on April 14, 2026, for Windows Server 2025, causes installation error 0x800F0983 on some systems. In addition, the April 2026 updates caused reboot errors on domain controllers running Windows Server 2016–2026, Microsoft released out-of-band updates (including KB5091157) on April 19, 2026, to resolve installation error 0x800F0983 and the reboot error.
I have received several error reports related to the cumulative update KB508206, released on April 14, 2024, for Windows Server 2025. In some environments, the installation of this update fails with error code 0x80073712. Other machines fail with installation error 0x800F0983. Microsoft has confirmed the latter installation error; and I got an explanation for install error 0x80073712 (blame legacy Windows Media Player app).
[German]The cumulative updates released on April 14, 2026, for Windows Server 2016 through Windows Server 2025 (e.g., KB508206 for Windows Server 2025) cause domain controllers to reboot under certain conditions. I got some reports from my German blog readers during the last hours.
There are several critical vulnerabilities in Microsoft Defender, that put Windows systems at risk. A security researcher has published an 0-day-exploit named BlueHammer on April 3, 2026, that has been patched on April 14, 2026. But there is still an unpatched vulnerability, where the security researcher has published the RedSun exploit. And ther is UnDefend, allowing to stop Windows Defender.
MVP:
2013 – 2016
WIMVP:
2017 – 2020
