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CVE-2026-49164 Microsoft CVE debrief

CVE-2026-49164 is a high-severity vulnerability in Active Directory Domain Services that allows an unauthorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.1 and is classified as HIGH. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. Administrators should review and update access controls for Active Directory Domain Services and monitor system logs for suspicious activity.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

Administrators and users of Active Directory Domain Services should be aware of this vulnerability and take necessary precautions to protect their systems. This includes reviewing and updating access controls, monitoring system logs, and implementing additional security measures. IT teams responsible for Windows-based systems should prioritize patching and verifying the integrity of their Active Directory Domain Services.

Technical summary

The vulnerability is a heap-based buffer overflow in Active Directory Domain Services that allows an unauthorized attacker to execute code over a network. The vulnerability has been assigned a CVSS score of 8.1 and is classified as HIGH. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. Microsoft has released a patch for this vulnerability, and users are advised to apply it as soon as possible.

Defensive priority

High

Recommended defensive actions

  • Apply the patch released by Microsoft
  • Review and update access controls for Active Directory Domain Services
  • Monitor system logs for suspicious activity
  • Implement additional security measures, such as network segmentation and intrusion detection
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The vulnerability is based on the CVE-2026-49164 record and the NVD detail page. The CVSS score and severity are based on the CVE-2026-49164 record. Evidence is limited to publicly available information and may not reflect the full scope of the vulnerability. Defenders should verify the vulnerability's impact on their systems and apply the patch as soon as possible. The CVE record was published on 2026-07-14T17:16:51.033Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49164 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49164

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

  • CVE-2026-49164 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49164

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

Supplemental references

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.