CVE-2026-62879
Awaiting Analysis Awaiting Analysis - Queue

Missing Authentication in Windows SmartScreen Allows Tampering

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description
Missing authentication for critical function in Windows SmartScreen allows an authorized attacker to perform tampering locally.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
CVE-2026-62879
EUVD
EUVD-2026-99838

Affected Vendors & Products

Showing 14 associated CPEs
Vendor Product Version / Range
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows 10 Version 21H2 10.0.19044.0
Microsoft Windows 10 Version 22H2 10.0.19045.0
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability involves missing authentication for a critical function in Windows SmartScreen. An authorized attacker can exploit this to perform tampering actions locally on affected systems.

Impact Analysis

An attacker could modify system files or settings locally, potentially leading to unauthorized changes, data corruption, or bypassing security controls. This could affect system integrity and stability.

Compliance Impact

This vulnerability allows local tampering via missing authentication in Windows SmartScreen. Such unauthorized modifications could compromise data integrity, potentially violating GDPR's integrity principle and HIPAA's security requirements for protected health information.

Mitigation Strategies

Apply the latest Windows security updates from Microsoft Update to patch the SmartScreen authentication flaw. Monitor Microsoft's advisory for additional mitigation guidance.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-62879. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart