CVE-2026-62879
Analyzed Analyzed - Analysis Complete

Missing Authentication in Windows SmartScreen Allows Tampering

Publication date: 2026-10-13

Last updated on: 2026-10-26

Assigner: Microsoft Corporation

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

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Meta Information

Published
2026-10-13
Last Modified
2026-10-26
Generated
2026-11-08
AI Q&A
2026-10-14
EPSS Evaluated
2026-11-07
NVD
CVE-2026-62879
EUVD
EUVD-2026-99838

Affected Vendors & Products

Showing 21 associated CPEs
Vendor Product Version / Range
microsoft windows_10_1809 to 10.0.17763.9376 (exc)
microsoft windows_10_1809 to 10.0.17763.9376 (exc)
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_10_21h2 to 10.0.19044.7807 (exc)
microsoft windows_11_23h2 to 10.0.22631.7652 (exc)
microsoft windows_11_23h2 to 10.0.22631.7652 (exc)
microsoft windows_11_24h2 to 10.0.26100.9711 (exc)
microsoft windows_11_24h2 to 10.0.26100.9711 (exc)
microsoft windows_11_25h2 to 10.0.26200.9711 (exc)
microsoft windows_11_25h2 to 10.0.26200.9711 (exc)
microsoft windows_11_26h1 to 10.0.28000.3231 (exc)
microsoft windows_11_26h1 to 10.0.28000.3231 (exc)
microsoft windows_11_26h2 to 10.0.26300.9711 (exc)
microsoft windows_11_26h2 to 10.0.26300.9711 (exc)
microsoft windows_server_2025 to 10.0.26100.33650 (exc)
microsoft windows_server_2022 to 10.0.20348.5761 (exc)
microsoft windows_server_2019 to 10.0.17763.9376 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)
microsoft windows_10_22h2 to 10.0.19045.7807 (exc)

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Exploitability

CWE
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KEV
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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.

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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.

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