Vulnerability · Published Jan 15, 2026 · Assigned by VulnCheck

CVE-2021-47776Umbraco v8.14.1 - 'baseUrl' SSRF

Medium 5.3

In plain English

A medium-severity server-side request forgery in Umbraco from umbraco. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.4%top 67.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
NuGet	umbracocms	no fix listed	GHSA-h66j-xm43-47pp

Affected products (as reported)

Vendor	Product	Versions
umbraco	Umbraco	8.14.1

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

In plain English

Official description

Affected packages & fixed versions

Affected products (as reported)

References