CVE intelligence

CVE-2026-56165

Vulnerability intelligence

Published Jul 24, 2026Sources checked Sep 28, 2026

9.8CRITICALCVSS out of 10

What this means

Review the available evidence

CVE-2026-56165 and is rated Critical severity with a CVSS score of 9.8. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.

CISA KEVNot listedBased on the latest collected catalog

EPSS1.0%Estimated 30-day exploitation probability

Ransomware useNot markedCISA KEV ransomware field

Threat actors0Source-linked actor relationships

Overview

What is CVE-2026-56165?

Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.