MICROSOFT published 200 vulnerabilities in the June 2026 Patch Tuesday, with significant patches addressing an unusually high number of browser vulnerabilities, particularly affecting the Chromium framework. Notably, a researcher named Nightmare Eclipse disclosed several uncoordinated vulnerabilities, raising alarm about potential exploitation of these flaws in fully patched systems.
Critical vulnerabilities include denial-of-service risks in HTTP/2, elevation of privilege issues in Microsoft PowerToys, and uncoordinated disclosures connected to Microsoft Defender. The Post also notes that several products are approaching end-of-support, with key lifecycle changes for SQL Server and SharePoint. Moreover, charts detailing vulnerabilities by product family and critical zero-day vulnerabilities were included, emphasizing the elevated risk landscape.