# CVE-2021-31950: Microsoft SharePoint Server Spoofing Vulnerability

> An attacker can exploit a Server-Side Request Forgery flaw in Microsoft SharePoint to access internal resources or bypass security controls.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Jun 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-xqq4-7jq4-8rv5

## What is CVE-2021-31950?

CVE-2021-31950 is a high-severity server-side request forgery vulnerability in Microsoft Sharepoint Foundation, published on 8 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Microsoft SharePoint Server Spoofing Vulnerability

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2021-31950?

It affects 2 products.


Products: Microsoft Sharepoint Foundation, Microsoft Sharepoint Server.

## How do I fix CVE-2021-31950?

No fix has been published for CVE-2021-31950 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-31950 being exploited?

There is no known exploitation of CVE-2021-31950 in the wild and no public exploit code.

Public exploit code:

- Microsoft SharePoint Server 16.0.10372.20060 - 'GetXmlDataFromDataSource' Server-Side Request Forgery (SSRF) (exploitdb)

## Other vulnerabilities in Microsoft Sharepoint Foundation

- [CVE-2014-2816](https://insights.sbomify.com/CVE-2014-2816/): Privilege escalation in n/a (critical 9.3)
- [CVE-2023-21742](https://insights.sbomify.com/CVE-2023-21742/): Microsoft SharePoint Server Remote Code Execution Vulnerability (high 8.8)
- [CVE-2023-21744](https://insights.sbomify.com/CVE-2023-21744/): Microsoft SharePoint Server Remote Code Execution Vulnerability (high 8.8)
- [CVE-2022-44690](https://insights.sbomify.com/CVE-2022-44690/): Microsoft SharePoint Server Remote Code Execution Vulnerability (high 8.8)
- [CVE-2022-41036](https://insights.sbomify.com/CVE-2022-41036/): Microsoft SharePoint Server Remote Code Execution Vulnerability (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-31950 and fix it if it is affected.

What it is: CVE-2021-31950 is a high-severity server-side request forgery vulnerability in Microsoft Sharepoint Foundation, published on 8 Jun 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2021-31950 in the wild and no public exploit code.

Affected product: Microsoft Sharepoint Foundation. 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-2021-31950/ (Markdown: https://insights.sbomify.com/CVE-2021-31950/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-31950
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-31950
- OSV: https://osv.dev/vulnerability/CVE-2021-31950

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From sbomify Insights: https://insights.sbomify.com/CVE-2021-31950/
Summaries are generated and may contain mistakes; the official description above is the record.