CVE-2026-83787: Windows DHCP Server Security Feature Bypass Vulnerability
Insufficient verification of data authenticity in Windows DHCP Server allows an authorized attacker to bypass a security feature locally.
Other sources
Windows DHCP Server Security Feature Bypass Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.26100.33650Patch KB5126646 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5761Patch KB5126655 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.14393.9612Patch KB5126868 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.17763.9376Patch KB5126651 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.3.9600.23470Patch KB5126836 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.2.9200.26434Patch KB5126835
Event History
Frequently Asked Questions
Who is exposed to this issue?
Systems running Windows DHCP Server are in scope, including the listed Windows Server versions and Microsoft Windows 10. Exploitation requires local access and authenticated privileges, so remotely reachable DHCP service alone is not sufficient based on the available information.
What access does an attacker need to exploit it?
An attacker must be authorized and have local access to the affected system. No user interaction is required.
What is the impact of successful exploitation?
Successful exploitation bypasses a security feature and can affect integrity. The provided severity vector indicates no confidentiality or availability impact.