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CVE-2021-47776

Umbraco v8.14.1 - 'baseUrl' SSRF

Published: Jan 15, 2026Updated: Jan 23, 2026 Sources: CVE List NVD GHSACWE-918
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 74.1%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

Umbracoumbraco
On-prem
Web & CMS Plugins / cms-core
umbraco cmsumbraco
On-premCMS Plugin
Web & CMS Plugins / cms-core
UmbracoCmsNuGetOSS Libraries
umbracocommercialDKWeb & CMS Pluginsaka umbraco cms, umbraco forms, umbraco-cms
nugetpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://www.exploit-db.com/exploits/50462
exploit-db.com
https://our.umbraco.com/
our.umbraco.com
https://releases.umbraco.com/all-releases
releases.umbraco.com
and 3 more references View all →

Timeline

Published
Jan 15, 2026
Last Updated
Jan 23, 2026

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