CyberICT

CVE-2026-103577

Microsoft · Published October 13, 2026

CVSS v3.1

HIGH
Patch availableGet patch

Description

Microsoft QUIC Security Feature Bypass Vulnerability. Insecure default variable initialization in Microsoft QUIC allows an unauthorized attacker to bypass a security feature over a network.

Affected Products

  • Windows 11 Version 26H2 for ARM64-based Systems
  • Windows 11 Version 26H2 for x64-based Systems
  • Windows Server 2022 (Server Core installation)
  • Windows 11 Version 23H2 for x64-based Systems

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:H/E:U/RL:O/RC:C