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 GetContextHe…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (4.2th 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

Weakness classification (CWE)

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

References

ExploitDB-50462 (exploit)
Umbraco Official Homepage (product)
Umbraco CMS Release Notes (product)

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.