Microsoft's June 2026 Patch Tuesday Fixes RCE Flaws

Microsoft's June 2026 Patch Tuesday addresses multiple vulnerabilities, including remote code execution bugs, across Windows, Office, Exchange, and Azure products; no in-the-wild exploitation reported.

Microsoft released its June 2026 monthly security update addressing numerous vulnerabilities across a broad swath of its product portfolio, including Windows OS components, Office, Exchange Server/Online, Azure services, .NET, Visual Studio Code, and various drivers and subsystems. The most severe vulnerabilities could allow remote code execution, potentially granting an attacker the same privileges as the logged-on user, enabling installation of programs, data manipulation, or creation of new accounts with full rights.

MS-ISAC notes there are currently no reports of active exploitation for these vulnerabilities in the wild. The affected systems list is extensive, spanning core Windows kernel and driver components (Win32K, NTFS, Kerberos, NTLM, Hyper-V, BitLocker, Secure Boot), enterprise services (Active Directory, Exchange, SharePoint, Dynamics 365), cloud infrastructure (Azure Kubernetes Service, Azure Stack Edge, Azure HorizonDB), and developer/AI tooling (GitHub Copilot, Visual Studio Code, M365 Copilot).

Organizations are advised to apply Microsoft's patches after appropriate testing, following standard vulnerability management practices including timely patch deployment, least-privilege enforcement, network segmentation, and exploit protection features. Given the absence of confirmed exploitation and the routine nature of this monthly advisory, this represents standard patch management guidance rather than an active threat event.

Source reporting: https://www.cisecurity.org/advisory/critical-patches-issued-for-microsoft-products-june-9-2026_2026-056