Description
Insufficient verification of data authenticity in Windows DHCP Server allows an authorized attacker to bypass a security feature locally.
Published: 2026-10-13
Score: 5.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Security Feature Bypass
Action: Apply Patch
AI Analysis

Impact

Microsoft Windows DHCP Server contains an insufficient verification of authenticity for data, permitting an authorized user with local access to bypass a defined security feature. This flaw represents a CWE‑288 authentication bypass weakness and can let the attacker alter or evade controls that protect DHCP operations, potentially undermining the confidentiality and integrity of DHCP configuration data.

Affected Systems

The affected versions cover Microsoft Windows 10 (1607 and 1809) and a range of Windows Server editions, from 2012 through 2025, including both full and Server Core installations. All listed builds are susceptible to this bypass when the DHCP server service is present.

Risk and Exploitability

The assessment assigns a CVSS score of 5.5, indicating medium severity; the EPSS score is 0.00288, indicating a very low exploitation probability, and the vulnerability is not listed in CISA's KEV catalog. Because the flaw requires local authorized privileges, it is unlikely to be exploited remotely, and no public exploits have been identified. Nonetheless, local administrators with discretionary access could take advantage of the bypass to modify DHCP settings without authorization.

Generated by OpenCVE AI on October 17, 2026 at 02:45 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Install the latest Windows update that addresses CVE‑2026‑83787 from Microsoft.
  • Restrict DHCP server administration to trusted accounts and enforce least‑privilege principles to limit local authorized users.
  • Monitor DHCP configuration changes through logging and audit trails to detect any unauthorized manipulations.

Generated by OpenCVE AI on October 17, 2026 at 02:45 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 29 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:x64:*

Fri, 23 Oct 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows Server 2012 (server Core Installation)
Microsoft windows Server 2012 R2
Microsoft windows Server 2012 R2 (server Core Installation)
Microsoft windows Server 2016 (server Core Installation)
Microsoft windows Server 2019 (server Core Installation)
Microsoft windows Server 2025 (server Core Installation)

Wed, 14 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 13 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
Description Insufficient verification of data authenticity in Windows DHCP Server allows an authorized attacker to bypass a security feature locally.
Title Windows DHCP Server Security Feature Bypass Vulnerability
First Time appeared Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
Weaknesses CWE-288
CPEs cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 10 1607
Microsoft windows 10 1809
Microsoft windows Server 2012
Microsoft windows Server 2012 R2
Microsoft windows Server 2016
Microsoft windows Server 2019
Microsoft windows Server 2022
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C'}


Subscriptions

Microsoft Windows 10 1607 Windows 10 1809 Windows Server 2012 Windows Server 2012 (server Core Installation) Windows Server 2012 R2 Windows Server 2012 R2 Windows Server 2012 R2 (server Core Installation) Windows Server 2016 Windows Server 2016 (server Core Installation) Windows Server 2019 Windows Server 2019 (server Core Installation) Windows Server 2022 Windows Server 2025 Windows Server 2025 (server Core Installation)
cve-icon MITRE

Status: PUBLISHED

Assigner: microsoft

Published:

Updated: 2026-10-31T18:03:15.595Z

Reserved: 2026-08-31T23:02:37.949Z

Link: CVE-2026-83787

cve-icon Vulnrichment

Updated: 2026-10-14T16:29:07.431Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-13T19:20:28.237

Modified: 2026-10-29T16:15:26.190

Link: CVE-2026-83787

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-23T16:30:18Z

Weaknesses
  • CWE-288

    Authentication Bypass Using an Alternate Path or Channel