CVE-2021-47776: Umbraco CMS contains a server-side request forgery vulnerability
CVE-2021-47776 · Severity: medium · CVSS 5.3 · Published 2026-01-15
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.
No. Junglewise Threat Intelligence has no report of CVE-2021-47776 being exploited in the wild.
How severe is CVE-2021-47776?
Medium severity, with a CVSS score of 5.3, published 15 January 2026.
Which products and versions are affected?
UmbracoCms (NuGet), Umbraco Cms. The advisory does not name versions.
Is there a fix for CVE-2021-47776?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2021-47776?
Check whether you run UmbracoCms (NuGet) or Umbraco Cms. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.