CVE-2026-78455: CWE-125: Out-of-bounds Read in Microsoft Windows 10 Version 1607
Description
Out-of-bounds read in Xbox allows an unauthorized attacker to disclose information with a physical attack.
CVSS v3.1
Score 4.3medium
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows 10 Version 21H2
Microsoft
Windows 10 Version 22H2
Microsoft
Windows 11 version 23H2
Microsoft
Windows 11 Version 23H2
Microsoft
Windows 11 Version 24H2
Microsoft
Windows 11 Version 25H2
Microsoft
Windows 11 version 26H1
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-78455) involves an out-of-bounds read in the Xbox component of Windows 10 Version 1607. An attacker with physical access can exploit this flaw to disclose sensitive information. The vulnerability affects multiple builds of Windows 10 Version 1607 and later updates, specifically versions from 10.0.14393.0 up to but not including 10.0.14393.9512, and other specified build ranges up to 10.0.28000.2954. The issue is tracked under CWE-125. Microsoft has published an official security update to remediate this vulnerability.
Potential Impact
An unauthorized attacker with physical access to a vulnerable Windows 10 device could exploit this out-of-bounds read vulnerability to disclose sensitive information. There is no indication of impact on integrity or availability. The CVSS vector indicates low attack complexity, no privileges required, and user interaction is required. The overall severity is medium.
Mitigation Recommendations
Microsoft has released an official security update that fixes this vulnerability. Users and administrators should apply the latest security patches from Microsoft to affected Windows 10 versions to remediate this issue. No additional mitigations are required beyond applying the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-24T16:21:50.287Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78455","vendor":"Microsoft"}]
Threat ID: 6aa0455facd9273b49faa147
Added to database: 09/08/2026, 17:26:55 UTC
Last enriched: 10/14/2026, 22:00:58 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 31
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