What is CVE-2021-47776?

CVE-2021-47776 is a medium-severity vulnerability in Umbraco, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-01-15.

How severe is CVE-2021-47776?

Medium severity. CVSS v3 base score is 5.3 out of 10.

SSRF in Umbraco

CVE-2021-47776

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (26.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Umbraco — versions 8.14.1
Umbraco Umbraco_cms — versions 8.14.1

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

disclosure@vulncheck.com (Exploit, VDB Entry, exploit)
disclosure@vulncheck.com (Product, product)
disclosure@vulncheck.com (product, Release Notes)

Frequently asked questions

What is CVE-2021-47776?: CVE-2021-47776 is a medium-severity vulnerability in Umbraco, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.3/10. Published 2026-01-15.
How severe is CVE-2021-47776?: Medium severity. CVSS v3 base score is 5.3 out of 10.