5.3
Medium
UmbracoCms

CVE-2021-47776

CVE-2021-47776 is a medium-severity server-side request forgery (SSRF) vulnerability in UmbracoCms (nuget), affecting versions = 8.14.1. No fixed version is listed yet.

Key facts
CVSS score
5.3
Medium
Attack vector
Network
Issuing authority
GitHub Advisory Database
Affected package
UmbracoCms
Fixed in
Not available
Disclosed
2021

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.

Impact

What is server-side request forgery (SSRF)?

Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside. Typical impact: access to internal metadata services, internal APIs, or cloud credentials.

Severity and exposure

CVE-2021-47776 has a CVSS score of 5.3 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment.

No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.

Affected versions

nuget

  • UmbracoCms (= 8.14.1)

Security releases

Not available
Kodem intelligence

Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.

Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter instead of chasing every advisory.

Kodem's runtime-powered SCA identifies whether CVE-2021-47776 is reachable in your applications. Explore open-source security for your team.

See if CVE-2021-47776 is reachable in your applications. Get a demo

Remediation advice

No fixed version is listed for CVE-2021-47776 yet.

In the interim: Validate and restrict destination URLs against an allowlist. Block requests to private IP ranges and cloud metadata endpoints.

Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.

Frequently asked questions about CVE-2021-47776

What is CVE-2021-47776?

CVE-2021-47776 is a medium-severity server-side request forgery (SSRF) vulnerability in UmbracoCms (nuget), affecting versions = 8.14.1. No fixed version is listed yet. Untrusted input controls the target URL of a server-initiated request, which may reach internal services not otherwise accessible from outside.

How severe is CVE-2021-47776?

CVE-2021-47776 has a CVSS score of 5.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.

Which versions of UmbracoCms are affected by CVE-2021-47776?

UmbracoCms (nuget) versions = 8.14.1 is affected.

Is there a fix for CVE-2021-47776?

No fixed version is listed for CVE-2021-47776 yet. Monitor the advisory for updates and apply mitigations in the interim.

Is CVE-2021-47776 exploitable, and should I be worried?

Whether CVE-2021-47776 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo

What actually determines whether CVE-2021-47776 is exploitable, and how bad it is?

Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.

How do I fix CVE-2021-47776?

No fixed version is listed yet. In the interim: Validate and restrict destination URLs against an allowlist. Block requests to private IP ranges and cloud metadata endpoints.

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