# CVE-2021-47776: Umbraco v8.14.1 - 'baseUrl' SSRF

> Attackers can exploit SSRF in Umbraco CMS dashboard endpoints to force the server to make unauthorized requests to external hosts.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 15 Jan 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-h66j-xm43-47pp

## What is CVE-2021-47776?

CVE-2021-47776 is a medium-severity server-side request forgery vulnerability in Umbraco Umbraco Cms, published on 15 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Umbraco CMS v8.14.1 contains a server-side request forgery vulnerability that allows attackers to manipulate baseUrl parameters in multiple dashboard and help controller endpoints. Attackers can craft malicious requests to the GetContextHelpForPage, GetRemoteDashboardContent, and GetRemoteDashboardCss endpoints to trigger unauthorized server-side requests to external hosts.

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

## Which versions are affected by CVE-2021-47776?

2 open source packages ship an affected version, including UmbracoCms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `UmbracoCms` | NuGet | All versions | None |
| `UmbracoCms` | NuGet | All versions | None |

Products: Umbraco Umbraco Cms.

## How do I fix CVE-2021-47776?

No fix has been published for CVE-2021-47776 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47776 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47776 exists.

## Other vulnerabilities in Umbraco Umbraco Cms

- [CVE-2025-67288](https://insights.sbomify.com/CVE-2025-67288/): Umbraco CMS has an arbitrary file upload vulnerability (critical 10.0)
- [CVE-2014-10074](https://insights.sbomify.com/CVE-2014-10074/): File upload in n/a (critical 9.8)
- [CVE-2012-1301](https://insights.sbomify.com/CVE-2012-1301/): Server-side request forgery in n/a (critical 9.8)
- [CVE-2012-10054](https://insights.sbomify.com/CVE-2012-10054/): Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE (critical 9.3)
- [CVE-2025-32017](https://insights.sbomify.com/CVE-2025-32017/): Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47776 and fix it if it is affected.

What it is: CVE-2021-47776 is a medium-severity server-side request forgery vulnerability in Umbraco Umbraco Cms, published on 15 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47776 exists.

Affected packages and fixed versions:
- UmbracoCms (NuGet): affected all versions; no fix listed
- UmbracoCms (NuGet): affected all versions; no fix listed

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-2021-47776/ (Markdown: https://insights.sbomify.com/CVE-2021-47776/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47776
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47776
- OSV: https://osv.dev/vulnerability/CVE-2021-47776

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47776/
Summaries are generated and may contain mistakes; the official description above is the record.