CVE-2026-55005

No fix known EPSS 1%CVSS 8.8

Heap-based buffer overflow in Microsoft Exchange Server allows an authorized attacker to execute code over a network.

Published 2026-07-14 · 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