---
id: CVE-2026-21262
title: >-
  Improper access control in SQL Server allows an authorized attacker to elevate
  privileges over a network.
summary: >-
  Improper access control in SQL Server allows an authorized attacker to elevate
  privileges over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-284
vendor: microsoft
product: sql_server_2016
affected:
  - 'sql_server_2016 >= 13.0.6300.2, < 13.0.6480.4'
  - 'sql_server_2016 >= 13.0.7000.253, < 13.0.7075.5'
  - 'sql_server_2017 >= 14.0.1000.169, < 14.0.2100.4'
  - 'sql_server_2017 >= 14.0.3006.16, < 14.0.3520.4'
  - 'sql_server_2019 >= 15.0.2000.5, < 15.0.2160.4'
  - 'sql_server_2019 >= 15.0.4003.23, < 15.0.4460.4'
  - 'sql_server_2022 >= 16.0.1000.6, < 16.0.1170.5'
  - 'sql_server_2022 >= 16.0.4003.1, < 16.0.4240.4'
  - 'sql_server_2025 >= 17.0.1000.7, < 17.0.1105.2'
  - 'sql_server_2025 >= 17.0.4006.2, < 17.0.4020.2'
patched:
  - sql_server_2016 13.0.7075.5
  - sql_server_2017 14.0.3520.4
  - sql_server_2019 15.0.4460.4
  - sql_server_2022 16.0.4240.4
  - sql_server_2025 17.0.4020.2
published: '2026-03-10'
updated: '2026-07-10'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21262'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21262'
    label: secure@microsoft.com
tags:
  - nvd
epss: 0.02044
epssPercentile: 0.8035
ingestedAt: '2026-07-10T20:06:10.620Z'
---

## Overview

Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.

## Affected

- `sql_server_2016 >= 13.0.6300.2, < 13.0.6480.4`
- `sql_server_2016 >= 13.0.7000.253, < 13.0.7075.5`
- `sql_server_2017 >= 14.0.1000.169, < 14.0.2100.4`
- `sql_server_2017 >= 14.0.3006.16, < 14.0.3520.4`
- `sql_server_2019 >= 15.0.2000.5, < 15.0.2160.4`
- `sql_server_2019 >= 15.0.4003.23, < 15.0.4460.4`
- `sql_server_2022 >= 16.0.1000.6, < 16.0.1170.5`
- `sql_server_2022 >= 16.0.4003.1, < 16.0.4240.4`
- `sql_server_2025 >= 17.0.1000.7, < 17.0.1105.2`
- `sql_server_2025 >= 17.0.4006.2, < 17.0.4020.2`

## Remediation

Upgrade past the affected range:

- `sql_server_2016 13.0.7075.5`
- `sql_server_2017 14.0.3520.4`
- `sql_server_2019 15.0.4460.4`
- `sql_server_2022 16.0.4240.4`
- `sql_server_2025 17.0.4020.2`