# CVE-2023-21777: Azure App Service on Azure Stack Hub Elevation of Privilege Vulnerability

> Attackers can elevate privileges in Azure App Service on Azure Stack Hub, requiring administrators to apply vendor patches.

- **Severity:** High 8.7 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L/E:U/RL:O/RC:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Feb 2023
- **Updated:** 19 Aug 2026
- **Also known as:** GHSA-462g-m6hg-7643

## What is CVE-2023-21777?

CVE-2023-21777 is a high-severity vulnerability in Microsoft Azure App Service on Azure Stack Hub, published on 14 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Azure App Service on Azure Stack Hub Elevation of Privilege Vulnerability

Weakness: CWE-269 (Improper Privilege Management), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2023-21777?

It affects 1 product.


Products: Microsoft Azure App Service on Azure Stack.

## How do I fix CVE-2023-21777?

No fix has been published for CVE-2023-21777 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-21777 being exploited?

There is no known exploitation of CVE-2023-21777 in the wild and no public exploit code.

## Other vulnerabilities in Microsoft Azure App Service on Azure Stack Hub

- [CVE-2019-1372](https://insights.sbomify.com/CVE-2019-1372/): Memory corruption in Azure App Service on Azure Stack (critical 10.0)
- [CVE-2018-8600](https://insights.sbomify.com/CVE-2018-8600/): Cross-site scripting in Azure App (medium 6.1)
- [CVE-2025-53765](https://insights.sbomify.com/CVE-2025-53765/): Azure Stack Hub Information Disclosure Vulnerability (medium 4.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-21777 and fix it if it is affected.

What it is: CVE-2023-21777 is a high-severity vulnerability in Microsoft Azure App Service on Azure Stack Hub, published on 14 Feb 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-21777 in the wild and no public exploit code.

Affected product: Microsoft Azure App Service on Azure Stack Hub. 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-2023-21777/ (Markdown: https://insights.sbomify.com/CVE-2023-21777/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-21777
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-21777
- OSV: https://osv.dev/vulnerability/CVE-2023-21777

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-21777/
Summaries are generated and may contain mistakes; the official description above is the record.