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Advisory record · GHSA-h66j-xm43-47pp

Umbraco CMS contains a server-side request forgery vulnerability

CVSS 6.9 MediumEPSS 0.0038 · 32nd percentile

Published by the GitHub Advisory Database at 15 Jan 2026, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
UmbracoCmsNuGet=8.14.1No fixed version yet
Identifiers
GHSA-h66j-xm43-47pp · CVE-2021-47776
Weakness (CWE)
CWE-918
Tags
Published
15 Jan 2026
Updated
3 Feb 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Umbraco CMS version 8.14.1 is vulnerable to server-side request forgery through the baseUrl parameter in several dashboard and help controller endpoints, including GetContextHelpForPage, GetRemoteDashboardContent, and GetRemoteDashboardCss. An attacker who can send requests to these endpoints can cause the server to make unauthorized requests to external hosts. The source gives few details about the required privileges. No fix is listed.

Written 9 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.9 Medium 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 CNA (VulnCheck)
  • CISA KEV Not listed.
  • EPSS 0.0038, the 32nd percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:22 UTC First seen by agentprime
  2. 31 Oct 2026, 15:22 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.