CVE-2021-47776

MEDIUM5.3EPSS 0.02%

Umbraco CMS contains a server-side request forgery vulnerability

Published: 1/15/2026Modified: 2/3/2026

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 (1)

NuGet/UmbracoCms

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 4.0	—	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L
osv	CVSS 3.1	MEDIUM5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References (5)

ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-47776
PATCHhttps://github.com/umbraco/Umbraco-CMS
WEBhttps://our.umbraco.com
WEBhttps://releases.umbraco.com/all-releases
WEBhttps://www.exploit-db.com/exploits/50462