CVE-2026-45503

No fix known EPSS <1%CVSS 8.1

Improper authorization in Microsoft Exchange Server allows an authorized attacker to disclose information over a network.

Published 2026-06-09 · CVE record · OSV

Products: Microsoft Exchange Server 2016 Cumulative Update 23, Microsoft Exchange Server 2019 Cumulative Update 14, Microsoft Exchange Server 2019 Cumulative Update 15, Microsoft Exchange Server Subscription Edition RTM