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)
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.004 (30.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Umbraco — versions 8.14.1
- Umbraco Cms — versions 8.14.1
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50462 (Exploit, VDB Entry, exploit)
- our.umbraco.com/ (Product, product)
- releases.umbraco.com/all-releases (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.