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CVE-2026-62703 Microsoft CVE debrief

The CVE-2026-62703 vulnerability is an out-of-bounds read issue in the Windows DWM Core Library, allowing an authorized attacker to disclose information locally. This vulnerability has a CVSS score of 5.5 and a severity rating of MEDIUM. It is tracked under CWE-125. System administrators and security teams should be aware of this vulnerability and take necessary actions to mitigate it. The CVE record was published on 2026-08-11T17:18:20.197Z and has not been modified since then. The NVD entry is currently Analyzed. Affected products include various versions of Windows 10, Windows 11, and Windows Server.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-11
Original CVE updated
2026-08-16
Advisory published
2026-08-11
Advisory updated
2026-08-16

Who should care

System administrators and security teams responsible for Windows systems, particularly those using Windows 10, Windows 11, and Windows Server, should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The CVE-2026-62703 vulnerability is an out-of-bounds read issue in the Windows DWM Core Library. This vulnerability allows an authorized attacker to disclose information locally. The Common Vulnerability Scoring System (CVSS) score for this vulnerability is 5.5, with a severity rating of MEDIUM. The vulnerability is tracked under CWE-125. Affected products include various versions of Windows 10, Windows 11, and Windows Server. The vulnerability can be mitigated by applying patches according to vendor guidance.

Defensive priority

Apply patches according to vendor guidance to address the out-of-bounds read vulnerability in Windows DWM Core Library.

Recommended defensive actions

  • Apply patches according to vendor guidance
  • Inventory and assess vulnerable systems
  • Monitor for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE-2026-62703 record indicates an out-of-bounds read vulnerability in Windows DWM Core Library, allowing an authorized attacker to disclose information locally. The CVSS score is 5.5 with a severity of MEDIUM. Affected products include various versions of Windows 10, Windows 11, and Windows Server.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-62703 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-62703

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

  • CVE-2026-62703 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-62703

    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.