CVE-2026-61928 — Windows Hello Tampering Vulnerability

Executive Summary

Cleartext storage of sensitive information in Windows Hello allows an authorized attacker to perform tampering locally.

Overview

5.5

CVSS MEDIUM

Important

MS Severity

Not Exploited

MS Exploit Status

Less Likely

MS Exploit Likelihood

Category Tampering

Released Aug 11 2026

Last Updated Aug 11 2026

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.0021 — 0.11462 percentile

NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

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

ATTACK VECTOR

Local

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

Low

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

None

INTEGRITY

High

AVAILABILITY

None

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 4.8

EPSS Score

0.0021

probability of exploitation in the next 30 days

0.11462 percentile - updated 2026-08-14

View on FIRST.org

Affected Products

18 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows 10 Version 1607 for 32-bit Systems	`5120418 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 1607 for x64-based Systems	`5120418 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 1809 for 32-bit Systems	`5120238 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 1809 for x64-based Systems	`5120238 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 21H2 for 32-bit Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 21H2 for ARM64-based Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 21H2 for x64-based Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 22H2 for 32-bit Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 22H2 for ARM64-based Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 10 Version 22H2 for x64-based Systems	`5120249 (Security Update)`	Important	Tampering	Yes
Windows 11 Version 23H2 for ARM64-based Systems	`5120240 (Security Update)`	Important	Tampering	Yes
Windows 11 Version 23H2 for x64-based Systems	`5120240 (Security Update)`	Important	Tampering	Yes
Windows 11 Version 24H2 for ARM64-based Systems 5120994 (Security Hotpatch Update) 5121003 (Security Update) Important Tampering 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 10.0.26100.9106 10.0.26100.9168 Yes None Windows 11 Version 24H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Tampering 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 10.0.26100.9168 10.0.26000.9106 Yes None Windows 11 Version 25H2 for ARM64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Tampering 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 25H2 for x64-based Systems 5121003 (Security Update) 5120994 (Security Hotpatch Update) Important Tampering 5101650 Base: 5.5 Temporal: 4.8 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C 10.0.26200.9168 10.0.26100.9106 Yes None Windows 11 Version 26H1 for ARM64-based Systems	`5121000 (Security Update)`	Important	Tampering	Yes
Windows 11 version 26H1 for x64-based Systems	`5121000 (Security Update)`	Important	Tampering	Yes
Windows Server 2016	`5120418 (Security Update)`	Important	Tampering	Yes
Windows Server 2016 (Server Core installation)	`5120418 (Security Update)`	Important	Tampering	Yes
Windows Server 2019	`5120238 (Security Update)`	Important	Tampering	Yes
Windows Server 2019 (Server Core installation)	`5120238 (Security Update)`	Important	Tampering	Yes

Patches

5 patches

Article	Type	Restart
`5120418`	Security Update	Yes
`5120238`	Security Update	Yes
`5120249`	Security Update	Yes
`5120240`	Security Update	Yes
`5121000`	Security Update	Yes

Known Exploits

No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.

Acknowledgments

Brandon Fisher

References

MSRC Advisory MITRE NVD