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PoC Published for Microsoft Windows Flaw That Allows Low-Privileged Users to Force Irrecoverable BSODs
Winsage
February 26, 2026

PoC Published for Microsoft Windows Flaw That Allows Low-Privileged Users to Force Irrecoverable BSODs

Security researchers have developed a working Proof of Concept (PoC) exploit for a vulnerability in the Windows kernel, identified as CVE-2026-2636, which allows low-privileged users to induce a Blue Screen of Death (BSoD), resulting in a Denial of Service. This vulnerability is linked to the Windows Common Log File System (CLFS) driver, specifically the CLFS.sys component, and arises from improper handling of invalid or special elements within CLFS (CWE-159). The PoC demonstrates that a non-administrative user can trigger the bug by executing a crafted ReadFile operation on a handle linked to an opened .blf log file without the expected I/O Request Packet (IRP) flags set. This leads to a critical inconsistency in the driver, causing Windows to invoke the kernel routine KeBugCheckEx, which results in a BSoD. The CVE-2026-2636 has a CVSS score of 5.5 (Medium) and poses a high impact on availability, allowing any authenticated user to crash the host reliably. Microsoft addressed this vulnerability in the September 2025 cumulative update, protecting systems running Windows 11 2024 LTSC and Windows Server 2025 by default. However, older or unpatched builds remain vulnerable. Organizations are advised to verify the deployment of the September 2025 updates, prioritize patching multi-user systems, and monitor for unusual spikes in BSoD events.
Microsoft Windows 11 KB5077181 Update Triggers Infinite Restart Loop on Some Devices
Winsage
February 17, 2026

Microsoft Windows 11 KB5077181 Update Triggers Infinite Restart Loop on Some Devices

Microsoft's Patch Tuesday update, KB5077181, released on February 10, 2026, has caused significant boot failures for users of Windows 11 versions 24H2 (OS build 26200.7840) and 25H2 (OS build 26100.7840), resulting in endless restart loops. Users are reporting over 15 reboot cycles, preventing access to their desktops. Issues include System Event Notification Service (SENS) errors and DHCP problems affecting internet connectivity. Installation errors with codes 0x800f0983 and 0x800f0991 indicate potential hardware, driver, or servicing stack incompatibilities. The update was intended to address 58 vulnerabilities, including six zero-days, but the boot loop issue has overshadowed these enhancements. CVE IDs and their CVSS scores related to the vulnerabilities addressed include: - CVE-2026-21510: 7.5 - CVE-2026-21519: 7.8 - CVE-2026-21533: 8.8 - CVE-2026-20841: 7.1 As of February 15, 2026, there is no "known issues" entry in Microsoft's release notes despite user reports. Users can uninstall the update through the Control Panel if their systems are accessible, or use the Windows Recovery Environment to execute commands for uninstallation if their systems are unbootable.
Phishing Lures Spread XWorm Remote Access Trojan
Tech Optimizer
February 16, 2026

Phishing Lures Spread XWorm Remote Access Trojan

A cyber-espionage campaign is utilizing the XWorm Remote Access Trojan (RAT) to infiltrate systems via phishing emails and a Microsoft Office vulnerability (CVE-2018-0802). XWorm, first detected in 2022, allows attackers remote control over infected computers for surveillance and data theft. The campaign uses business-oriented phishing emails with malicious Excel attachments that exploit the vulnerability to execute a fileless attack. The malware connects to a command-and-control server, encrypting communications and transmitting system details. XWorm features a plugin architecture with over 50 modules for various malicious activities, including credential theft and DDoS attacks. Security experts highlight the ongoing risk of legacy software vulnerabilities and recommend patching outdated components.
Multiple Flaws Found in Microsoft Windows & Office — Could Let Hackers In
Winsage
February 16, 2026

Multiple Flaws Found in Microsoft Windows & Office — Could Let Hackers In

Microsoft has identified at least six zero-day vulnerabilities in Windows and Microsoft Office that were actively being exploited by hackers before patches were released. These vulnerabilities allow attackers to compromise systems with minimal user interaction, such as clicking on malicious links or opening compromised Office documents. Notable examples include a Windows Shell Security Bypass (CVE-2026-21510) and an Office File Exploit that can execute malicious code. The vulnerabilities pose serious risks, including active exploitation, remote code execution, and the potential for malware installation and credential theft. Microsoft has released security patches to address these vulnerabilities, and users are urged to install them immediately. The affected systems include all supported versions of Windows and Microsoft Office applications. Users are advised to install updates, be cautious with emails and links, enable security tools, and keep software up to date.
Microsoft Fixes Critical Windows 11 Notepad Flaw
Winsage
February 14, 2026

Microsoft Fixes Critical Windows 11 Notepad Flaw

Microsoft has released a patch for a significant vulnerability in Notepad on Windows 11 that could allow attackers to execute code by opening a Markdown file and clicking on a malicious link. This vulnerability was due to how Notepad processed links within Markdown files, which could trigger unverified protocols to load remote content. The patch now includes a security warning before such links can be activated. Users are advised to check for updates via Windows Update and the Microsoft Store to ensure Notepad and related components are up to date. Security tips include inspecting URLs before clicking and keeping Microsoft Defender features enabled.
Check for Windows 11 updates. Microsoft patched a big vulnerability.
Winsage
February 12, 2026

Check for Windows 11 updates. Microsoft patched a big vulnerability.

Microsoft has addressed a "remote code execution" vulnerability in Windows 11's Notepad application that could allow malicious actors to exploit Markdown files. The vulnerability occurs when a user clicks a harmful link in a Markdown file, potentially leading to the execution of unverified protocols and remote files with the same permissions as the user. Microsoft has implemented a warning system to alert users about unsafe links before they proceed. Users are advised to manually verify that their Windows 11 installations are current to ensure security.
Microsoft says hackers are exploiting critical zero-day bugs to target Windows and Office users
Winsage
February 12, 2026

Microsoft says hackers are exploiting critical zero-day bugs to target Windows and Office users

Microsoft has addressed critical security vulnerabilities in its Windows operating system and Office suite that are actively exploited by malicious actors. These vulnerabilities include one-click attacks that can be triggered by users clicking on malicious links or opening compromised Office files. Known as zero-days, these flaws were exploited before Microsoft could implement fixes. One significant vulnerability, tracked as CVE-2026-21510, affects the Windows shell and allows hackers to bypass Microsoft's SmartScreen feature, potentially enabling remote malware installation. Another vulnerability, CVE-2026-21513, is found in the MSHTML browser engine, allowing hackers to install malware by bypassing security measures. Microsoft has also patched three other zero-day bugs that were under active exploitation.
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