202310 Cumulative Update For Windows 11 For X64based Systems Kb5031358 Exclusive Jun 2026

KB5031358 was more than just a monthly security update for Windows 11. It was a for the first version of Windows 11. While it brought essential protections against the critical "HTTP/2 Rapid Reset" DDoS attack and fixed dozens of bugs, its primary legacy is as the final patch for Windows 11 version 21H2. For the majority of users, installing this update was a necessity before the inevitable and required upgrade to Windows 11 version 22H2 or 23H2 to maintain a secure computing environment. Any x64-based system still running this outdated version of Windows 11 is strongly advised to upgrade to a newer, supported version immediately to remain protected against modern threats.

| Attribute | Details | |-----------|---------| | | KB5031358 | | OS Build | 22621.2428 (Windows 11 version 22H2) | | Release Date | October 10, 2023 (Patch Tuesday) | | Type | Security + Cumulative Update | | Architecture | x64 (AMD64/Intel 64) – ARM64 version exists separately | | Replaces | KB5030219 (September 2023 CU) | | Restart Required | Yes (full) | | Known Issue Alert | Yes – see Section 5 |

Allow the system to download 2023-10 Cumulative Update for Windows 11 Version 22H2 for x64-based Systems (KB5031358) . Reboot your PC when prompted to complete the installation. Method 2: Microsoft Update Catalog (Manual Installation) KB5031358 was more than just a monthly security

Is your PC currently , or have you already upgraded?

: A Microsoft WordPad information disclosure flaw that allowed attackers to steal NTLM hashes. For the majority of users, installing this update

x64-based systems (standard desktop/laptop processors) and ARM64-based systems.

: A known issue where BitLocker might incorrectly report a 65000 error in Managed Device Management (MDM) environments. Reboot your PC when prompted to complete the installation

KB5031358 patches several critical security flaws, including vulnerabilities associated with the Layer 2 Tunneling Protocol (L2TP) and the Windows Scripting Engine. These patches prevent malicious actors from executing unauthorized code remotely. System Requirements for Installation