CVE-2026-21264

⛔ critical

Summary

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Account allows an unauthorized attacker to perform spoofing over a network.

CVSS Score

9.3

Critical

EPSS Score

0.1

Exploit Probability

Published Date

2026-01-22

First Seen: 2026-01-28

📊 Relative Risk Intelligence

This CVE is High Risk - more severe than 88.6% of all 340,620 vulnerabilities in our database.

#38,817

Top 25% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jan 23, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

Requires human interaction

💥 Technical Impact

Total

Complete system compromise possible

SSVC data provided by CISA

Last Modified 2026-02-03

Source NVD 🔗

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

CWE IDs (Weakness Types)

CWE-79

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-56165	⛔ critical	9.8	0.7	Heap-based buffer overflow in Microsoft Account allows an unauthorized attacker to execute code over a network.	2026-07-24
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

CVE-2026-21264

Summary

📊 Relative Risk Intelligence

🎯 CISA SSVC Assessment Updated: Jan 23, 2026

📦 Affected Products 1

🔗 References 1

🔗 Related CVEs 2