CVE-2021-47776

Umbraco v8.14.1 - 'baseUrl' SSRF

Published Jan 15, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-h66j-xm43-47pp Umbraco CMS contains a server-side request forgery vulnerability
History
Type Values Removed Values Added
First Time appeared Umbraco umbraco Forms
CPEs cpe:2.3:a:umbraco:umbraco_forms:8.14.1:*:*:*:*:*:*:*
Vendors & Products Umbraco umbraco Forms
Type Values Removed Values Added
First Time appeared Umbraco umbraco Cms
CPEs cpe:2.3:a:umbraco:umbraco_cms:8.14.1:*:*:*:*:*:*:*
Vendors & Products Umbraco umbraco Cms
Type Values Removed Values Added
First Time appeared Umbraco
Umbraco umbraco
Vendors & Products Umbraco
Umbraco umbraco
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Umbraco v8.14.1 - 'baseUrl' SSRF
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 8, 2026, 3:20 PM
Reserved
Jan 14, 2026, 2:39 PM
Status
Analyzed
Published
Jan 15, 2026, 4:16 PM
Modified
Oct 8, 2026, 4:16 PM