CVE-2026-56648: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows 10 Version 1607
Time-of-check time-of-use (toctou) race condition in Windows Network File System allows an authorized attacker to elevate privileges over a network.
AI Analysis
Technical Summary
This vulnerability is a TOCTOU race condition (CWE-367) in the Windows Network File System on Windows 10 Version 1607. It allows an attacker with authorized network access to exploit the timing discrepancy between checking and using resources, leading to privilege escalation. The issue affects Windows 10 Version 1607 build 10.0.14393.0. Microsoft has released an official fix to address this vulnerability.
Potential Impact
An authorized attacker can exploit this race condition over the network to elevate their privileges, potentially gaining higher-level access than intended. This can lead to full compromise of affected systems, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56648 to remediate this vulnerability.
CVE-2026-56648: CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition in Microsoft Windows 10 Version 1607
Description
Time-of-check time-of-use (toctou) race condition in Windows Network File System allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 7.5high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability is a TOCTOU race condition (CWE-367) in the Windows Network File System on Windows 10 Version 1607. It allows an attacker with authorized network access to exploit the timing discrepancy between checking and using resources, leading to privilege escalation. The issue affects Windows 10 Version 1607 build 10.0.14393.0. Microsoft has released an official fix to address this vulnerability.
Potential Impact
An authorized attacker can exploit this race condition over the network to elevate their privileges, potentially gaining higher-level access than intended. This can lead to full compromise of affected systems, impacting confidentiality, integrity, and availability.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56648 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-22T15:17:38.796Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-56648","vendor":"Microsoft"}]
Threat ID: 6a5676bc68715ace43f0af6a
Added to database: 07/14/2026, 17:49:48 UTC
Last enriched: 07/14/2026, 18:36:28 UTC
Last updated: 07/15/2026, 00:07:28 UTC
Views: 2
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