cve-2026-48566

CVE-2026-48566 is an Important-rated information disclosure vulnerability in the Windows DWM Core Library, disclosed by Microsoft on June 9, 2026, as part of that month's Patch Tuesday updates. The flaw affects supported Windows client and server systems and is addressed through the normal cumulative update channel. While not as severe as remote code execution bugs, this vulnerability is notable because DWM is integral to every interactive desktop session, making information disclosure in this area a potential stepping stone for broader attack chains. Administrators are advised to apply the June 2026 cumulative updates to mitigate the risk, but the overall guidance emphasizes confidence and context over panic.