How to fix CVE-2021-47776?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Is Umbraco Cms affected by CVE-2021-47776?

Organizations using Umbraco CMS v8.14.1 should be aware of moderate risk from CVE-2021-47776, a server-side request forgery vulnerability rated CVSS 5.3. Users could be tricked into performing unintended actions. Proof-of-concept code is publicly available.

CVE-2021-47776

MEDIUM

2026-01-15 [email protected]

GHSA-h66j-xm43-47pp

5.3

CVSS 3.1

CVSS Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 23, 2026 - 18:06 vuln.today

Public exploit code

CVE Published

Jan 15, 2026 - 16:16 nvd

MEDIUM 5.3

Description

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.

Analysis

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. [CVSS 5.3 MEDIUM]

Technical Context

Classified as CWE-918 (Server-Side Request Forgery (SSRF)). Affects Umbraco Cms. 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.

Affected Products

Vendor: Umbraco. Product: Umbraco Cms. Versions: up to 8.14.1.

Remediation

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +0.0

CVSS: +26

POC: +20

CVE-2021-47776 vulnerability details – vuln.today

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CVE-2021-47776

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CVE-2021-47776

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Lifecycle Timeline

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Description

Analysis

Technical Context

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External POC / Exploit Code