CVE-2026-85865: CWE-288: Authentication Bypass Using an Alternate Path or Channel in Microsoft Windows 10 Version 1607
Description
CVE-2026-85865 is a medium severity vulnerability in Microsoft Windows 10 Version 1607 and related versions, involving improper authentication in the Windows DHCP Server. This flaw allows a locally authorized attacker to bypass a security feature, potentially leading to unauthorized actions that impact system integrity. The vulnerability does not affect confidentiality or availability. An official fix is available from Microsoft.
CVSS v3.1
Score 5.5medium
Affected software
Microsoft
Windows 10 Version 1607
Microsoft
Windows 10 Version 1809
Microsoft
Windows Server 2012
Microsoft
Windows Server 2012 (Server Core installation)
Microsoft
Windows Server 2012 R2
Microsoft
Windows Server 2012 R2 (Server Core installation)
Microsoft
Windows Server 2016
Microsoft
Windows Server 2016 (Server Core installation)
Microsoft
Windows Server 2019
Microsoft
Windows Server 2019 (Server Core installation)
Microsoft
Windows Server 2022
Microsoft
Windows Server 2025
Microsoft
Windows Server 2025 (Server Core installation)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-85865) is classified as CWE-288, indicating an authentication bypass using an alternate path or channel. It affects Windows DHCP Server components in multiple Windows 10 and Windows Server versions. The issue allows an attacker with local privileges to bypass a security feature due to improper authentication handling. The CVSS 3.1 base score is 5.5 (medium severity), with attack vector local, low attack complexity, low privileges required, no user interaction, unchanged scope, no confidentiality or availability impact, but high integrity impact. Microsoft has published an official fix for this vulnerability.
Potential Impact
An attacker with local access and low privileges can bypass a security feature in the Windows DHCP Server, potentially leading to unauthorized modification or control over certain system functions. There is no impact on confidentiality or availability, but integrity is affected. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85865 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-09-04T18:15:10.739Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85865","vendor":"Microsoft"}]
Threat ID: 6ace85482cdf04f6569fec59
Added to database: 10/13/2026, 19:23:52 UTC
Last enriched: 10/14/2026, 03:04:15 UTC
Last updated: 10/14/2026, 03:04:15 UTC
Views: 2
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