PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-49178 Microsoft CVE debrief

CVE-2026-49178 is a high-severity vulnerability in Active Directory Domain Services that allows an authorized attacker to execute code over a network. The vulnerability has a CVSS score of 8.8 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 access controls and implement additional security measures such as network segmentation and intrusion detection.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 8.8
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 prevent exploitation. Operators, platform administrators, and security teams should review affected deployments and implement compensating controls where necessary.

Technical summary

The vulnerability is a heap-based buffer overflow in Active Directory Domain Services that allows an authorized attacker to execute code over a network. The vulnerability has been assigned a CVSS score of 8.8 and is classified as HIGH. The vulnerability affects multiple versions of Windows, including Windows 10, Windows 11, and Windows Server. Affected deployments should be identified and patched 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 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-2026-49178 record and the NVD detail page. The CVSS score and severity are based on the CVE-2026-49178 record. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected deployments and review official advisories for specific guidance. Limited additional information is available for validation.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-49178 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-49178

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

  • CVE-2026-49178 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-49178

    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.