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Windows Hello

CVE-2026-20852 — Windows Hello Tampering Vulnerability

Important CVSS 7.7 EPSS 0.00482 2026-01 archive

Executive Summary

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

Overview

7.7
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Tampering
Released Jan 13 2026
Last Updated Jan 13 2026
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00482 — 0.37723 percentile
NVD CVSS 7.7 HIGH — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
None
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7

EPSS Score

0.00482
probability of exploitation in the next 30 days
0.37723 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

25 affected products
Product KB Article Severity Impact Restart Required
Windows 10 Version 1607 for 32-bit Systems 5073722 (Security Update) Important Tampering Yes
Windows 10 Version 1607 for x64-based Systems 5073722 (Security Update) Important Tampering Yes
Windows 10 Version 1809 for 32-bit Systems 5073723 (Security Update) Important Tampering Yes
Windows 10 Version 1809 for x64-based Systems 5073723 (Security Update) Important Tampering Yes
Windows 10 Version 21H2 for 32-bit Systems 5073724 (Security Update) Important Tampering Yes
Windows 10 Version 21H2 for ARM64-based Systems 5073724 (Security Update) Important Tampering Yes
Windows 10 Version 21H2 for x64-based Systems 5073724 (Security Update) Important Tampering Yes
Windows 10 Version 22H2 for 32-bit Systems 5073724 (Security Update) Important Tampering Yes
Windows 10 Version 22H2 for ARM64-based Systems 5073724 (Security Update) Important Tampering Yes
Windows 10 Version 22H2 for x64-based Systems 5073724 (Security Update) Important Tampering Yes
Windows 11 Version 23H2 for ARM64-based Systems 5073455 (Security Update) Important Tampering Yes
Windows 11 Version 23H2 for x64-based Systems 5073455 (Security Update) Important Tampering Yes
Windows 11 Version 24H2 for ARM64-based Systems 5074109 (Security Update) Important Tampering Yes
Windows 11 Version 24H2 for x64-based Systems 5074109 (Security Update) Important Tampering Yes
Windows 11 Version 25H2 for ARM64-based Systems 5074109 (Security Update) Important Tampering Yes
Windows 11 Version 25H2 for x64-based Systems 5074109 (Security Update) Important Tampering Yes
Windows Server 2016 5073722 (Security Update) Important Tampering Yes
Windows Server 2016 (Server Core installation) 5073722 (Security Update) Important Tampering Yes
Windows Server 2019 5073723 (Security Update) Important Tampering Yes
Windows Server 2019 (Server Core installation) 5073723 (Security Update) Important Tampering Yes
Windows Server 2022 5073457 (Security Update) Important Tampering Yes
Windows Server 2022 (Server Core installation) 5073457 (Security Update) Important Tampering Yes
Windows Server 2022, 23H2 Edition (Server Core installation) 5073450 (Security Update) Important Tampering Yes
Windows Server 2025 5073379 (Security Update) Important Tampering Yes
Windows Server 2025 (Server Core installation) 5073379 (Security Update) Important Tampering Yes

Patches

8 patches
Article Type Restart
5073722 Security Update Yes
5073723 Security Update Yes
5073724 Security Update Yes
5073455 Security Update Yes
5074109 Security Update Yes
5073457 Security Update Yes
5073450 Security Update Yes
5073379 Security Update Yes

Known Exploits

Acknowledgments

None

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