CVE-2026-85865

Analyzed Analyzed - Analysis Complete

Improper Authentication in Windows DHCP Server

Publication date: 2026-10-13

Last updated on: 2026-10-29

Assigner: Microsoft Corporation

Description

Improper authentication in Windows DHCP Server allows an authorized attacker to bypass a security feature locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-13

Last Modified

2026-10-29

Generated

2026-11-08

AI Q&A

2026-10-14

EPSS Evaluated

2026-11-07

NVD

CVE-2026-85865

EUVD

EUVD-2026-99568

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	windows_server_2012	r2
microsoft	windows_server_2012	*
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1607	to 10.0.14393.9612 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_10_1809	to 10.0.17763.9376 (exc)
microsoft	windows_server_2025	to 10.0.26100.33650 (exc)
microsoft	windows_server_2022	to 10.0.20348.5761 (exc)
microsoft	windows_server_2016	to 10.0.14393.9612 (exc)
microsoft	windows_server_2019	to 10.0.17763.9376 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-288	The product requires authentication, but the product has an alternate path or channel that does not require authentication.

Attack-Flow Graph

Executive Summary

This vulnerability involves improper authentication in Windows DHCP Server. An authorized attacker can bypass a security feature locally, potentially gaining unauthorized access or privileges.

Impact Analysis

An attacker could exploit this to bypass security controls on affected systems, leading to unauthorized access or privilege escalation. Systems running vulnerable Windows versions are at risk.

Compliance Impact

This vulnerability allows an authorized attacker to bypass a security feature locally, which could undermine access controls and authentication mechanisms. This may impact compliance with standards like GDPR (data protection) and HIPAA (health data security) by weakening security controls required for protecting sensitive data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Windows DHCP Server to address the improper authentication issue. Ensure all affected systems listed in the CPEs are updated.

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EPSS Chart

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