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Microsoft Xbox Remote Code Execution Vulnerability

CVE-2026-66801 is a remote code execution vulnerability in Xbox (rated Important, CVSS 9.8).

1 version

Facts

Microsoft id
CVE-2026-66801
Products
Xbox
Severity
Important
Impact
Remote Code Execution
CVSS
9.8
CVSS vector
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
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
Customer action required
Yes
Release
2026-Nov
Assigned by
Microsoft
Weakness
CWE-122: Heap-based Buffer Overflow
MSRC revision
1.0
Status pages
Xbox network status
First captured by us
Microsoft last modified
Source
Security updates · open the original at Microsoft

Microsoft's revision notes

  1. Revision 1.0, 2026-11-10: Information published.

Microsoft says

Heap-based buffer overflow in Xbox allows an unauthorized attacker to execute code over a network. How could an attacker exploit this vulnerability?

Security updates,

Read Microsoft's full post

What Microsoft changed

One version so far. If Microsoft edits it, each change shows here with what was removed and added.

  1. First version we captured ·

    The text as we first saw it

    Seen by us · Microsoft's timestamp · Microsoft's page

Other changes for Xbox network