CVE-2026-66801ImportantRCE

Microsoft Xbox Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity: Important
CVSS base score: Not published
Impact: Remote Code Execution
Exploitation detected: No known exploitation (MSRC assessment)
Exploitability: Exploitation Less Likely
Publicly disclosed: No (MSRC assessment)
EPSS · 30-day forecast: No EPSS score collected
Customer action: Required: follow the MSRC remediation guidance

More details

Public detection template: No Nuclei template is listed in the current collected catalog
Component: Xbox
Weakness: CWE-122: Heap-based Buffer Overflow
Issued by: Microsoft
Published: 10 Nov 2026 · November 2026
Last revised: 10 Nov 2026

Updates that fix it

0 KBs

No KB listed

No KB update is listed in the collected MSRC record. Check the MSRC advisory for product releases and other remedies.

Affected products

Windows

1 affected product

Microsoft GDK on Xbox

Page history

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Explore global source statements, affected packages and advisory history for CVE-2026-66801. The catalog has a separate collection scope from Microsoft release records.

cve-program · CVE-2026-66801

Published

Microsoft GDK

Vendor product

Original vendor version evidence · not evaluated as a NuGet range

{
                    "vendor": "Microsoft",
                    "product": "Microsoft GDK",
                    "platforms": [
                        "Xbox"
                    ],
                    "versions": [
                        {
                            "version": "1.0.0.0",
                            "lessThan": "2610",
                            "versionType": "custom",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON