CVE-2021-47776 — Vulnerability in UmbracoCms — CVE Details

MEDIUM

Umbraco CMS contains a server-side request forgery vulnerability

Published January 15, 2026Updated February 3, 2026Source: osv

Summary

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.

Advisory Timeline

First published January 15, 2026 (270 days ago).
Last revised February 3, 2026 — 18 days after initial publication.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

Package	Ecosystem	Affected	Fixed In
UmbracoCms	nuget	8.14.1	No fix available

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

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

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.3 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Frequently Asked Questions

What is CVE-2021-47776?: Umbraco CMS contains a server-side request forgery vulnerability This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.3/10).
How do I check if my project is affected by CVE-2021-47776?: CVE-2021-47776 affects UmbracoCms. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2021-47776 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

5.3

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-h66j-xm43-47pp

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