CVE-2026-62703 Microsoft CVE debrief

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.

Official resources