CVE-2021-47776Public exploitNetwork attack vector

Unauthenticated SSRF via unchecked baseUrl parameters

Published Jan 15, 2026 · Updated Jan 15, 2026

Server-side request forgery in Umbraco CMS 8.14.1 allows remote attackers to make the server request attacker-chosen hosts. The GetContextHelpForPage, GetRemoteDashboardContent, and GetRemoteDashboardCss endpoints accept a baseUrl parameter and use it as the destination for outbound requests without restricting the target host. No authentication or user interaction is required; a crafted HTTP request originates from the CMS server's network position.

CVSS severity6.9
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Server-side request forgery in Umbraco CMS 8.14.1 allows remote attackers to make the server request attacker-chosen hosts. The GetContextHelpForPage, GetRemoteDashboardContent, and GetRemoteDashboardCss endpoints accept a baseUrl parameter and use it as the destination for outbound requests without restricting the target host. No authentication or user interaction is required; a crafted HTTP request originates from the CMS server's network position.

The record

CVE
CVE-2021-47776
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
Umbraco
Product
Umbraco CMS
Classifications
CWE-918, CAPEC-664, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=8.14.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Umbraco · Umbraco CMSversion=8.14.1

Published CVSS scores

6.9GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CAPEC-664Server Side Request Forgery
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo