GHSA-54mj-vcvj-q3v5MediumCVSS 10.0

Umbraco CMS has an arbitrary file upload vulnerability

Published
December 22, 2025
Last Modified
January 22, 2026

🔗 CVE IDs covered (1)

📋 Description

An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code via uploading a crafted PDF file. While Umbraco provides hooks to perform file validation, it does not do implement filtering by default. Users are expected to implement their own validation.

Note: This vulnerability is disputed by Ubraco.

🎯 Affected products1

  • nuget/Umbraco.Cms:<= 16.3.3

🔗 References (6)