CVE-2026-66801 Microsoft Xbox Remote Code Execution Vulnerability

CriticalCVSS 9.8

Published: 2026-11-10 20:15
Updated: 2026-11-11 01:46
Exploit status: No public exploit known

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Description

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

Affected products

Product	Affected versions	Fixed in
microsoft gdk	< 2610	2610
microsoft gdk	>= 1.0.0.0, < 2610	2610

References

MSRC Security Update Guide patch vendor-advisory

CVSS v3.1

9.8 Critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High
Exploit Code Maturity: Unproven
Remediation Level: Official Fix
Report Confidence: Confirmed

Weakness & likelihood

EPSS (exploitation probability, 30 days): Not available
CWE: CWE-122 Heap-based Buffer Overflow

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.