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CVE-2026-20919: Windows SMB Server Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

Microsoft Security Response Center
#vulnerability#windows#samba#auth#Windows SMB Server#Security Vulnerability
CVE-2026-20818: Windows Kernel Information Disclosure Vulnerability

Insertion of sensitive information into log file in Windows Kernel allows an unauthorized attacker to disclose information locally.

CVE-2026-20816: Windows Installer Elevation of Privilege Vulnerability

Time-of-check time-of-use (toctou) race condition in Windows Installer allows an authorized attacker to elevate privileges locally.

CVE-2026-20812: LDAP Tampering Vulnerability

Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.

CVE-2026-0386: Windows Deployment Services Remote Code Execution Vulnerability

**Are there additional steps I need to take to be protected from this vulnerability?** Admins should take the following steps to be protected from CVE-2026-0386: 1. Audit existing WDS usage and identify hands-free deployments. 2. Opt in for protection by configuring the registry settings described in: Windows Deployment Services (WDS) Hands-Free Deployment Hardening Guidance. This will provide immediate protection. This security protection will be enabled by default in a future security update release and no additional administrator action will be required. **How is Microsoft addressing this vulnerability?** To address this vulnerability, by default the hands-free deployment feature will not be supported beginning with a security update in a future release in mid-2026. **Why is the WDS Unattended Installation feature being deprecated?** The legacy WDS workflow transmits unattend.xml over unauthenticated RPC, exposing sensitive credentials during PXE boot. This creates a securi...

CVE-2026-20805: Desktop Window Manager Information Disclosure Vulnerability

Exposure of sensitive information to an unauthorized actor in Windows Win32K - ICOMP allows an authorized attacker to disclose information locally.

CVE-2026-20804: Windows Hello Tampering Vulnerability

Incorrect privilege assignment in Windows Hello allows an unauthorized attacker to perform tampering locally.

CVE-2026-20808: Windows File Explorer Elevation of Privilege Vulnerability

Concurrent execution using shared resource with improper synchronization ('race condition') in Printer Association Object allows an authorized attacker to elevate privileges locally.