---
id: CVE-2026-78455
title: >-
  Out-of-bounds read in Xbox allows an unauthorized attacker to disclose
  information with a physical attack.
summary: >-
  Out-of-bounds read in Xbox allows an unauthorized attacker to disclose
  information with a physical attack.
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
vendor: microsoft
product: windows_10_1607
affected:
  - windows_10_1607 < 10.0.14393.9512
  - windows_10_1809 < 10.0.17763.9245
  - windows_10_21h2 < 10.0.19044.7725
  - windows_10_22h2 < 10.0.19045.7725
  - windows_11_23h2 < 10.0.22631.7582
  - windows_11_24h2 < 10.0.26100.9445
  - windows_11_25h2 < 10.0.26200.9445
  - windows_11_26h1 < 10.0.28000.2954
  - windows_server_2016 < 10.0.14393.9512
  - windows_server_2019 < 10.0.17763.9245
patched:
  - windows_10_1607 10.0.14393.9512
  - windows_10_1809 10.0.17763.9245
  - windows_10_21h2 10.0.19044.7725
  - windows_10_22h2 10.0.19045.7725
  - windows_11_23h2 10.0.22631.7582
  - windows_11_24h2 10.0.26100.9445
  - windows_11_25h2 10.0.26200.9445
  - windows_11_26h1 10.0.28000.2954
  - windows_server_2016 10.0.14393.9512
  - windows_server_2019 10.0.17763.9245
published: '2026-09-08'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:05:41.790'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78455'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78455'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-08T19:43:47.683041Z'
epss: 0.00501
epssPercentile: 0.41914
ingestedAt: '2026-09-08T19:08:49.629Z'
---

## Overview

Out-of-bounds read in Xbox allows an unauthorized attacker to disclose information with a physical attack.

## Affected

- `windows_10_1607 < 10.0.14393.9512`
- `windows_10_1809 < 10.0.17763.9245`
- `windows_10_21h2 < 10.0.19044.7725`
- `windows_10_22h2 < 10.0.19045.7725`
- `windows_11_23h2 < 10.0.22631.7582`
- `windows_11_24h2 < 10.0.26100.9445`
- `windows_11_25h2 < 10.0.26200.9445`
- `windows_11_26h1 < 10.0.28000.2954`
- `windows_server_2016 < 10.0.14393.9512`
- `windows_server_2019 < 10.0.17763.9245`

## Remediation

Upgrade past the affected range:

- `windows_10_1607 10.0.14393.9512`
- `windows_10_1809 10.0.17763.9245`
- `windows_10_21h2 10.0.19044.7725`
- `windows_10_22h2 10.0.19045.7725`
- `windows_11_23h2 10.0.22631.7582`
- `windows_11_24h2 10.0.26100.9445`
- `windows_11_25h2 10.0.26200.9445`
- `windows_11_26h1 10.0.28000.2954`
- `windows_server_2016 10.0.14393.9512`
- `windows_server_2019 10.0.17763.9245`