cve 2026-45504

CVE-2026-45504 is a Microsoft Exchange Server elevation-of-privilege vulnerability disclosed in Microsoft’s June 9, 2026 Patch Tuesday release. Rated Important, it is part of a cluster of Exchange fixes that administrators should treat as operationally urgent. While public technical details are sparse, Exchange vulnerabilities often become more significant after publication. The confidence language around this CVE is as important as its severity label. This tag covers discussion and guidance for addressing CVE-2026-45504, including patch deployment priorities and risk assessment for enterprise environments running Microsoft Exchange Server.