Improper Input Validation in Windows Hello Enables Remote Bypass

Publication date: 2026-04-14

Last updated on: 2026-04-22

Assigner: Microsoft Corporation

Description

Improper input validation in Windows Hello allows an unauthorized attacker to bypass a security feature over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-04-14

Last Modified

2026-04-22

Generated

2026-07-06

AI Q&A

2026-04-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-27928

EUVD

EUVD-2026-22481

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2016	to 10.0.14393.9060 (exc)
microsoft	windows_server_2019	to 10.0.17763.8644 (exc)
microsoft	windows_server_2022	to 10.0.20348.5020 (exc)
microsoft	windows_server_2022_23h2	to 10.0.25398.2274 (exc)
microsoft	windows_server_2025	to 10.0.26100.32690 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-20	The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper input validation in Windows Hello, a Microsoft authentication feature. It allows an unauthorized attacker to bypass a security feature remotely over a network.

Impact Analysis

The vulnerability can allow an attacker to bypass security controls without proper authorization, potentially leading to unauthorized access to sensitive information or systems. Given the high CVSS score of 8.7, it poses a significant risk to confidentiality and integrity.

Hi! I’m here to help you understand CVE-2026-27928. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70