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CVE-2026-54115 Microsoft CVE debrief

CVE-2026-54115 is an integer overflow or wraparound vulnerability in Windows Active Directory. An authorized attacker can exploit this vulnerability to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. It exists in Windows Active Directory and can be exploited by an authorized attacker to elevate privileges locally. The vulnerability is caused by an integer overflow or wraparound. Affected products include various versions of Windows 10, Windows 11, and Windows Server. System administrators and security teams should review the official advisory for specific guidance.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-21
Advisory published
2026-07-14
Advisory updated
2026-07-21

Who should care

System administrators and security teams responsible for managing Windows Active Directory and ensuring the security of their organization's systems should be aware of this vulnerability. They should review the official advisory for specific guidance and implement necessary controls to mitigate the risk of exploitation.

Technical summary

The vulnerability exists in Windows Active Directory and can be exploited by an authorized attacker to elevate privileges locally. The vulnerability is caused by an integer overflow or wraparound and has been assigned a CVSS score of 7.8. Affected products include various versions of Windows 10, Windows 11, and Windows Server. The official CVE record and NVD entry provide further details on the vulnerability.

Defensive priority

High

Recommended defensive actions

  • Apply patches or updates provided by Microsoft to vulnerable systems
  • Implement compensating controls, such as monitoring and access controls, to reduce the risk of exploitation
  • Conduct regular vulnerability assessments and penetration testing to identify and address potential vulnerabilities
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-14T18:18:07.537Z and was last modified on 2026-07-21T19:54:45.620Z. The NVD entry is currently Analyzed. The vulnerability affects various versions of Windows 10, Windows 11, and Windows Server. There may be additional details in the official CVE record or NVD entry that could provide further context.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54115 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54115

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

  • CVE-2026-54115 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54115

    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.