# CVE-2026-21262: SQL Server Elevation of Privilege Vulnerability

> An authorized attacker can elevate privileges over the network due to improper access control in Microsoft SQL Server.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Mar 2026
- **Updated:** 19 Jun 2026
- **Also known as:** GHSA-wmrr-4347-6m3q

## What is CVE-2026-21262?

CVE-2026-21262 is a high-severity vulnerability in Microsoft Sql Server 2016, published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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

Weakness: CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2026-21262?

It affects 5 products.


Products: Microsoft Sql Server 2016, Microsoft Sql Server 2017, Microsoft Sql Server 2019, Microsoft Sql Server 2022, Microsoft Sql Server 2025.

## How do I fix CVE-2026-21262?

No fix has been published for CVE-2026-21262 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21262 being exploited?

There is no known exploitation of CVE-2026-21262 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Sql Server 2016

- [CVE-2026-54117](https://insights.sbomify.com/CVE-2026-54117/): Microsoft SQL Server Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-54118](https://insights.sbomify.com/CVE-2026-54118/): Microsoft SQL Server Remote Code Execution Vulnerability (critical 9.8)
- [CVE-2026-47295](https://insights.sbomify.com/CVE-2026-47295/): Microsoft SQL Server Elevation of Privilege Vulnerability (high 8.8)
- [CVE-2026-55002](https://insights.sbomify.com/CVE-2026-55002/): Microsoft SQL Server Elevation of Privilege Vulnerability (high 8.8)
- [CVE-2026-40370](https://insights.sbomify.com/CVE-2026-40370/): SQL Server Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21262 and fix it if it is affected.

What it is: CVE-2026-21262 is a high-severity vulnerability in Microsoft Sql Server 2016, published on 10 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-21262 in the wild and no public exploit code.

Affected product: Microsoft Sql Server 2016. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-21262/ (Markdown: https://insights.sbomify.com/CVE-2026-21262/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21262
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21262
- OSV: https://osv.dev/vulnerability/CVE-2026-21262

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-21262/
Summaries are generated and may contain mistakes; the official description above is the record.