zero-day vulnerability Archives

Tech Optimizer

February 16, 2026

What is the best PC antivirus for 2026: Acronis True Image vs. competitors

In 2026, traditional antivirus solutions are becoming outdated due to the rise of sophisticated cyber threats, including AI-driven ransomware and advanced phishing schemes. The FBI Internet Crime Report states that cybercrime losses exceeded .5 billion in 2023, with projections by Cybersecurity Ventures estimating costs could reach trillion annually by 2025. Research from IBM shows that organizations without a tested recovery plan face higher costs and longer downtimes. Built-in protections like Windows Defender and MacOS XProtect offer basic security but may leave gaps, necessitating comprehensive third-party antivirus solutions. Acronis True Image is highlighted for its unique combination of real-time malware protection and full system backup capabilities, enabling users to recover quickly from incidents. Other leading antivirus solutions, such as Norton 360, Bitdefender, McAfee, and Kaspersky, excel in threat prevention but lack integrated recovery options. Acronis emphasizes the importance of both security and continuity, preparing users for both cyber incidents and everyday failures.

Winsage

February 11, 2026

Patch Tuesday, February 2026 Edition

Microsoft has released updates addressing over 50 vulnerabilities in its Windows operating systems and applications, including six critical zero-day vulnerabilities. 1. CVE-2026-21510: A security feature bypass in Windows Shell that allows execution of malicious content via a single click on a link, affecting all supported Windows versions. 2. CVE-2026-21513: Targets MSHTML, the web browser engine in Windows. 3. CVE-2026-21514: A security feature bypass in Microsoft Word. 4. CVE-2026-21533: Allows local attackers to gain SYSTEM level access in Windows Remote Desktop Services. 5. CVE-2026-21519: An elevation of privilege flaw in the Desktop Window Manager (DWM). 6. CVE-2026-21525: A potential denial-of-service threat in the Windows Remote Access Connection Manager. Additionally, the updates include fixes for remote code execution vulnerabilities affecting GitHub Copilot and various IDEs, specifically CVE-2026-21516, CVE-2026-21523, and CVE-2026-21256, which arise from a command injection flaw. Security experts emphasize the importance of safeguarding developers due to their access to sensitive data and recommend applying least-privilege principles.

Winsage

January 19, 2026

The Last Windows Security Updates of January 2026 Are Here

Microsoft released its first set of security updates for the Windows operating system and various products in January 2026, addressing over 110 vulnerabilities. The updates are available for all supported versions of Windows, with Windows 10 receiving fixes only through the Extended Security Updates (ESU) program. Windows 11 versions 24H2 and 25H2 are the main consumer releases benefiting from these updates. Approximately 112–114 security updates were released, with around 8 rated as Critical. At least one zero-day vulnerability is actively exploited. The updates include security fixes for Windows, Office, Edge, Azure, and server components. Windows 11 versions 23H2, 24H2, and 25H2, as well as Windows Server 2023 and 2025, have known issues. Windows 11 version 24H2 and 25H2 received security fixes for multiple vulnerabilities, while version 23H2 continues to receive support through enterprise servicing channels. Windows 10 updates are limited to ESU-enrolled systems, with general support ending in October 2025. Windows Server 2016, 2019, 2022, 2023, and 2025 received January security updates, addressing important vulnerabilities without disclosing any critical ones. Microsoft also released updates for Office products and SharePoint Server components. Known issues after the January updates include credential prompt failures and authentication issues in Azure Virtual Desktop and Windows 365, particularly affecting the new Windows App. Workarounds involve using the classic Remote Desktop client or the web-based RDP client. Additionally, devices with Secure Launch enabled may experience shutdown and sleep mode failures. Microsoft has provided out-of-band fixes for certain affected systems as of January 18, 2026. Users can manually install updates through the Windows Update feature, and it is recommended to create a full system backup before proceeding with updates.

Winsage

January 15, 2026

Windows info-disclosure 0-day bug gets a fix as CISA sounds alarm

Microsoft and the U.S. government have issued a warning about a vulnerability in Windows, designated CVE-2026-20805, which is currently being exploited. This flaw allows an authorized attacker to leak a memory address from a remote ALPC port, potentially leading to arbitrary code execution. It has a medium severity rating of 5.5 on the CVSS scale. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added this vulnerability to its Known Exploited Vulnerabilities catalog and requires federal agencies to implement a patch by February 3. Additionally, two other vulnerabilities were acknowledged: CVE-2026-21265, a secure boot certificate expiration bypass with a CVSS rating of 6.4, and CVE-2023-31096, an elevation of privilege flaw affecting third-party Agere Modem drivers, rated at 7.8. Two more vulnerabilities, CVE-2026-20952 (CVSS 7.7) and CVE-2026-20953 (CVSS 7.4), are use-after-free flaws in Office that could allow unauthorized code execution.

Winsage

January 13, 2026

Microsoft fixes 114 flaws in year’s first Windows 11 Patch Tuesday

Microsoft's January 2026 Patch Tuesday update, KB5074109, addresses 114 vulnerabilities, including a critical zero-day vulnerability (CVE-2026-20805) in the Windows Desktop Window Manager (DWM) that has been actively exploited. The update is applicable to Windows 11 versions 24H2 and 25H2 and includes security enhancements and updates to AI components. Other high-severity vulnerabilities addressed include CVE-2026-20816 (privilege escalation in Windows Installer), CVE-2026-20817 (elevation of privilege in Windows Error Reporting), CVE-2026-20840 (vulnerability in Windows NTFS), CVE-2026-20843 (flaw in Routing and Remote Access Service), CVE-2026-20860 (vulnerability in Ancillary Function Driver for WinSock), and CVE-2026-20871 (another DWM vulnerability). The update removes legacy modem drivers to minimize the attack surface and resolves reliability issues in Azure Virtual Desktop and WSL networking. It also changes the default setting for Windows Deployment Services (WDS) to disable hands-free deployment. Users can install the update through Windows Update, and a system reboot is required for full application.

Winsage

December 12, 2025

New Windows RasMan zero-day flaw gets free, unofficial patches

Free unofficial patches are available for a newly identified Windows zero-day vulnerability that allows attackers to crash the Remote Access Connection Manager (RasMan) service, which operates with SYSTEM-level privileges and manages VPN and remote network connections. This denial-of-service flaw was discovered by ACROS Security while investigating a previously patched privilege escalation vulnerability (CVE-2025-59230) in RasMan. The new zero-day has not yet received a CVE ID and affects all Windows versions from Windows 7 to Windows 11, including Windows Server 2008 R2 through Server 2025. The vulnerability can be exploited by unprivileged users due to a coding error in how RasMan processes circular linked lists, leading to a crash when a null pointer is encountered. ACROS Security is providing free micropatches through its 0Patch service until Microsoft releases an official fix. Users must create an account and install the 0Patch agent to apply the micropatch automatically.

Winsage

December 11, 2025

Microsoft’s Latest ‘Patch Tuesday’ Update Fixes These Three Zero-Days

Microsoft's December Patch Tuesday update addresses three critical zero-day vulnerabilities and a total of 56 bugs, including: - 28 elevation-of-privilege vulnerabilities - 19 remote-code-execution vulnerabilities - 4 information-disclosure vulnerabilities - 3 denial-of-service vulnerabilities - 2 spoofing vulnerabilities Three remote code execution flaws are classified as "critical." One zero-day vulnerability, CVE-2025-62221, allows attackers to gain SYSTEM privileges through the Windows Cloud Files Mini Filter Driver. The other two vulnerabilities fixed are: - CVE-2025-64671: A remote code execution vulnerability in GitHub Copilot for Jetbrains, exploitable via Cross Prompt Injection. - CVE-2025-54100: A PowerShell remote code execution vulnerability that can execute scripts from a webpage using Invoke-WebRequest. CVE-2025-62221 is attributed to MSTIC and MSRC, CVE-2025-64671 was disclosed by Ari Marzuk, and CVE-2025-54100 was identified by multiple security researchers.

Winsage

December 9, 2025

Microsoft releases Windows 10 KB5071546 extended security update

Microsoft has released the KB5071546 extended security update, addressing 57 security vulnerabilities, including three critical zero-day flaws. This update is intended for Windows 10 Enterprise LTSC users and those in the ESU program. Users can install it by navigating to Settings, selecting Windows Update, and performing a manual 'Check for Updates'. The update will automatically install and prompt for a restart. After installation, Windows 10 will be upgraded to build 19045.6691, and Windows 10 Enterprise LTSC 2021 will move to build 19044.6691. The update focuses on security enhancements and bug fixes, including a remote code execution vulnerability in PowerShell (CVE-2025-54100). PowerShell 5.1 will now issue a warning when using the "Invoke-WebRequest" command to alert users about potential script execution risks. Users are advised to use the -UseBasicParsing command line argument to prevent embedded scripts from executing. Microsoft has confirmed there are no known issues with this update.

Winsage

December 3, 2025

Microsoft mitigates Windows LNK flaw exploited as zero-day

Microsoft has addressed a security vulnerability in Windows tracked as CVE-2025-9491, which allows malicious actors to embed harmful commands in Windows LNK files, requiring user interaction to exploit. Threat actors often distribute these files in ZIP formats to bypass email security. In March 2025, 11 hacking groups, including Evil Corp and Kimsuky, were actively exploiting this vulnerability using various malware payloads. Although Microsoft initially did not consider the issue urgent, it later modified the handling of LNK files in November updates to allow users to view the entire character string in the Target field. However, this change does not eliminate the malicious arguments embedded in the files. ACROS Security has released an unofficial patch that restricts shortcut target strings to 260 characters and alerts users about risks associated with long target strings, covering multiple Windows versions.

Winsage

November 16, 2025

Bad News For Microsoft Windows 10 Users — Another Security Update Fail

Users of Windows 10 are facing challenges due to a bot attack threat and a critical zero-day vulnerability, necessitating immediate updates for Windows 10, 11, and Server users. Microsoft has confirmed that some users enrolled in the Extended Security Updates (ESU) program are experiencing difficulties installing the November 2025 security update, KB5068781, resulting in the error code “0x800f0922 (CBSEINSTALLERS_FAILED).” This issue primarily affects business users with corporate licenses activated via Windows subscription activation through the Microsoft 365 Admin Center. There are currently no known workarounds, and Microsoft is investigating the problem.