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.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
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
Which versions are affected by CVE-2021-47776?
2 open source packages ship an affected version, including UmbracoCms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
UmbracoCms NuGet | All versions | None |
UmbracoCms NuGet | All versions | None |
Products include 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.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
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 Umbraco CMS has an arbitrary file upload vulnerability
- CVE-2014-10074 File upload in n/a
- CVE-2012-1301 Server-side request forgery in n/a
- CVE-2012-10054 Umbraco CMS < 4.7.1 codeEditorSave.asmx RCE
- CVE-2025-32017 Umbraco has a Management API Vulnerability to Path Traversal With Authenticated Users
Sources
Also known as GHSA-h66j-xm43-47pp.