CVE-2026-56165

⛔ critical

🔍 Scan for this CVE

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

CVSS Score

9.8

Critical

EPSS Score

0.7

Exploit Probability

Published Date

2026-07-24

First Seen: 2026-07-31

This CVE is Very High Risk - more severe than 90.5% of all 340,620 vulnerabilities in our database.

#32,287

Top 10% most severe

Severity Percentile

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-07-30

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE IDs (Weakness Types)

CWE-122

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-21264	⛔ critical	9.3	0.1	Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unau...	2026-01-22
CVE-2025-21396	⚠️ high	8.2	2.8	Missing authorization in Microsoft Account allows an unauthorized attacker to elevate privileges over a network.	2025-01-29

📦 Affected Products 1