Category Archives: Security

Windows Defender 0-days: BlueHammer (patched) and RedSun (unpatched)

Posted on 2026-04-17 by guenni

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 … Continue reading →

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Remote Desktop Phishing Protection in the April 2026 Update Causes Confusion

Posted on 2026-04-17 by guenni

[German]On April 14, 2026 (Patch Day), Microsoft released a fix for Remote Desktop to protect RDP connections against phishing attacks. Users now see a warning message when establishing an RDP connection. This has caused a lot of confusion and issues. … Continue reading →

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ESU Extension (Phase 2) for Exchange 2016/2019 and Skype

Posted on 2026-04-16 by guenni

[German]Microsoft has announced an extension of the Extended Security Update (ESU) program for certain legacy software. This includes Microsoft Exchange 2016/2019 and Skype for Business Server, for which ESU "Period 2" is now being launched. This means that organizations can … Continue reading →

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Microsoft April 2026 updates for Office and Windows

Posted on 2026-04-15 by guenni

On April 14, 2026 (the second Tuesday of the month, Microsoft's Patch Tuesday), Microsoft released cumulative updates for the still-supported client operating system versions of Windows 10 (with an ESU license) and Windows 11. Microsoft has also released security updates … Continue reading →

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Microsoft Security Update Summary (April 14, 2026)

Posted on 2026-04-14 by guenni

[German]On April 14, 2026, Microsoft released security updates for Windows clients and servers, for Office, and for other products. The security updates address 163 vulnerabilities (CVEs), 8 of which are critical; 2 of these were classified as zero-day vulnerabilities (one … Continue reading →

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Why ISL Online: Critical factors when choosing a remote desktop solution

[Sponsored Post]In the rapidly evolving IT world, choosing the right remote desktop software is critical for organizations that value security, ease of use and reliability. One provider of secure remote access that has been on the market since 2001 is ISL Online, which presents some considerations for choosing such software below. More ...

Adobe Reader: Emergency patch for 0-day vulnerability CVE-2026-34621

Posted on 2026-04-12 by guenni

[German]A few hours ago, I reported on a zero-day vulnerability in Adobe Reader. Simply opening a PDF file can be enough to take control of the system. Adobe has now confirmed the vulnerability (CVE-2026-34621) and released a security update to … Continue reading →

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Malware: Website hosting CPUID, HWMonitor, CPU-Z, etc., hacked

Posted on 2026-04-10 by guenni

[German]Warning to users who use tools such as CPUID, HWMonitor, CPU-Z, etc. and updated it recently (between April 9, and April 10, 2026. The website where these tools were hosted and offered for download has fallen victim to a supply … Continue reading →

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Vulnerability CVE-2026-3055 in Citrix NetScaler ADC and Gateway is being exploited

Posted on 2026-03-29 by guenni

On March 24, 2026, I warned of two critical vulnerabilities in the Citrix products mentioned in the post Critical vulnerabilities in Citrix NetScaler ADC and Gateway (March 2026). Now attacks exploiting one of these vulnerabilities are being observed in the … Continue reading →

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Critical vulnerabilities in Citrix NetScaler ADC and Gateway (March 2026)

Posted on 2026-03-25 by guenni

[German]Citrix has issued a warning about several security vulnerabilities classified as critical in its Citrix Gateway and Citrix Netscaler ADC. CERT Bund has also published a corresponding advisory. Citrix has released firmware updates to address these vulnerabilities.

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Google Chrome 146.0.7680.164/165 fixes 8 vulnerabilities

Posted on 2026-03-24 by guenni

[German]A quick note for Google Chrome users. On March 23, 2026, Google released a new version of Chrome (146.0.7680.164/165) that addresses eight vulnerabilities in the browser. They are rated as high. It feels like the browser has to be updated … Continue reading →

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