PT-2026-58249 · Microsoft · Exchange Server 2016 Cumulative Update 23+3

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-55005

NVD

CVSS v3.1

8.8

High

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Fix

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-55005

Affected Products

Exchange Server 2016 Cumulative Update 23

Exchange Server 2019 Cumulative Update 14

Exchange Server 2019 Cumulative Update 15

Exchange Server Subscription Edition Rtm

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-55005 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55005 · Vendor Advisory