Server-Side Request Forgery in Umbraco CMS by Umbraco
CVE-2021-47776

6.9MEDIUM

Key Information:

Vendor

Umbraco

Status
Umbraco
Vendor
CVE Published:
15 January 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47776?

Umbraco CMS v8.14.1 is susceptible to a server-side request forgery vulnerability that can be exploited by attackers to manipulate baseUrl parameters across various dashboard and help controller endpoints. This flaw enables unauthorized server-side requests to external hosts through carefully crafted requests targeting the GetContextHelpForPage, GetRemoteDashboardContent, and GetRemoteDashboardCss endpoints. Organizations using this version should evaluate their security posture and consider applying available patches to mitigate potential risks.

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Affected Version(s)

Umbraco 8.14.1

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47776 - Proof of Concept

References

https://www.exploit-db.com/exploits/50462
exploit
https://our.umbraco.com/
product
https://releases.umbraco.com/all-releases
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

NgoAnhDuc
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