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CVE-2026-42983 Microsoft CVE debrief

CVE-2026-42983 is a use-after-free vulnerability in the Windows DWM Core Library. This vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. An authorized attacker can exploit this vulnerability locally to elevate privileges.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-06-11
Advisory published
2026-06-09
Advisory updated
2026-06-11

Who should care

Administrators and users of Windows operating systems should be aware of this vulnerability, especially those with local access to affected systems.

Technical summary

The vulnerability exists in the Windows DWM Core Library and is caused by a use-after-free error. This allows an attacker with local access and appropriate privileges to exploit the vulnerability and elevate their privileges.

Defensive priority

High

Recommended defensive actions

  • Apply patches from Microsoft as soon as possible.
  • Ensure that all Windows operating systems and related components are up-to-date.
  • Restrict local access to sensitive systems and monitor for suspicious activity.

Evidence notes

The CVE-2026-42983 record was published on 2026-06-09T17:17:14.197Z and last modified on 2026-06-11T16:54:16.457Z. The vulnerability affects multiple versions of Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42983 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42983

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

  • CVE-2026-42983 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42983

    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.