Windows Security
The latest Windows Security coverage — news, analysis, and updates from the WindowsNews.AI desk.
CVE-2026-21237: Critical WSL Privilege Escalation Vulnerability Analysis & Mitigation
Microsoft has disclosed a critical elevation-of-privilege vulnerability in Windows Subsystem for Linux (WSL) tracked as CVE-2026-21237, which security researchers and administrators are treating as a...
Critical Windows HTTP.sys Vulnerability CVE-2026-21232: Patch Analysis & Security Implications
Microsoft has issued an urgent security update addressing a critical elevation-of-privilege vulnerability in the Windows HTTP protocol stack, designated CVE-2026-21232, which affects the HTTP.sys...
CVE-2026-21241: Critical Windows AFD Kernel Vulnerability Demands Immediate Patching
Microsoft has issued an urgent security advisory for CVE-2026-21241, a critical elevation-of-privilege vulnerability in the Windows Ancillary Function Driver for WinSock (AFD, afd.sys) that could...
CVE-2026-21239: How Microsoft's New Confidence Signal is Transforming Windows Patch Management
Microsoft's introduction of a "confidence" indicator alongside CVE-2026-21239 represents a fundamental shift in how the company communicates vulnerability severity and drives enterprise security...
Urgent Windows LDAP Vulnerability Threatens Domain Controllers: What to Do Now
Microsoft has disclosed a new vulnerability in the Windows Lightweight Directory Access Protocol (LDAP) that can be used to launch denial-of-service attacks against domain controllers and other...
New Windows NTLM Spoofing Flaw Puts Enterprises on High Alert — Here’s What to Do Now
Microsoft has assigned a new CVE identifier — CVE-2026-21249 — to a freshly disclosed Windows NTLM spoofing vulnerability, and while the company’s public advisory remains sparse on technical...
Urgent Windows Patch: CVE-2026-21245 Lets Attackers Escalate to SYSTEM – What to Do
Microsoft has confirmed a new Windows kernel vulnerability, tracked as CVE-2026-21245, that could allow an attacker with local access to gain SYSTEM-level privileges. The flaw was patched in the...
Windows HTTP.sys Vulnerability Could Let Attackers Gain SYSTEM Access — Update Now
Microsoft’s latest security advisory warns of a high-severity elevation of privilege vulnerability in the Windows HTTP protocol stack, known as HTTP.sys, that could allow an attacker to gain full...
CVE-2026-21251: Critical Windows Failover Cluster Vulnerability Explained
Microsoft has disclosed a significant security vulnerability affecting Windows Server Failover Clusters, designated CVE-2026-21251, which presents a critical elevation-of-privilege risk in enterprise...
CVE-2026-21253: Critical Windows Mailslot EoP Vulnerability - Patch Analysis & Mitigation Guide
Microsoft has disclosed a critical elevation of privilege vulnerability in the Windows Mailslot file system driver, designated CVE-2026-21253, which could allow attackers to gain SYSTEM-level...
Critical Windows HTTP.sys Flaw CVE-2026-21250: Patch Analysis & Security Impact
Microsoft has issued an urgent security update addressing a critical elevation of privilege vulnerability in the Windows HTTP protocol stack, designated as CVE-2026-21250. This kernel-mode flaw in...
Microsoft Patches RasMan Flaw That Lets Local Users Crash VPNs with a Symlink (CVE-2026-21525)
Microsoft has released a security update addressing CVE-2026-21525, a denial-of-service vulnerability in the Windows Remote Access Connection Manager (RasMan) that could allow an authorized local...