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CVE-2026-69876 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-09-08T17:16:44.282Z and has not been modified since then. The NVD entry is currently not provided. This high-severity vulnerability in Windows DHCP Server allows authorized attackers to execute code over an adjacent network. Defenders should prioritize verifying exposure, applying patches, and restricting access to mitigate the risk of exploitation. The vulnerability affects multiple versions of Windows 10, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. System administrators and security teams

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-10-08
Advisory published
2026-09-08
Advisory updated
2026-10-08

Who should care

Defenders responsible for Windows DHCP Server installations, particularly those with adjacent network access, should assess exposure and apply patches. System administrators and security teams managing Windows Server environments are advised to prioritize verification and remediation efforts.

Why it matters

CVE-2026-69876 is a high-severity vulnerability in Windows DHCP Server that allows authorized attackers to execute code over an adjacent network. Defenders should prioritize verifying exposure, applying patches, and restricting access to mitigate the risk of exploitation.

  • Verify exposure of Windows DHCP Server installations to unauthorized code execution
  • Apply patches to prevent exploitation
  • Restrict adjacent network access to mitigate attack vector
  • Monitor for unauthorized changes to DHCP Server configurations

Technical summary

The Windows DHCP Server Remote Code Execution Vulnerability (CVE-2026-69876) is a use-after-free vulnerability that allows an authorized attacker to execute code over an adjacent network. The vulnerability affects multiple versions of Windows 10, Windows Server 2012, Windows Server 2012 R2, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Defensive priority

Defenders should prioritize verifying exposure of Windows DHCP Server installations and applying patches, focusing on systems with adjacent network access.

Recommended defensive actions

  • Verify exposure of Windows DHCP Server installations
  • Apply patches for affected versions
  • Restrict adjacent network access to DHCP Server systems
  • Monitor for unauthorized changes to DHCP Server configurations

Evidence notes

The CVE record and source item provide details on the vulnerability in Windows DHCP Server, allowing an authorized attacker to execute code over an adjacent network. Affected versions and patches are specified in the source item.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-69876 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-69876

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-69876 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-69876

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Windows DHCP Server Remote Code Execution Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/69xxx/CVE-2026-69876.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69876

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.