CVE-2025-67288: Umbraco CMS has an arbitrary file upload vulnerability

December 22, 2025 (updated January 22, 2026)

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.

References

docs.umbraco.com/umbraco-cms/reference/security/serverside-file-validation
github.com/advisories/GHSA-54mj-vcvj-q3v5
github.com/github/advisory-database/pull/6633
github.com/umbraco/Umbraco-CMS
github.com/vuquyen03/CVE/tree/main/CVE-2025-67288
nvd.nist.gov/vuln/detail/CVE-2025-67288

Code Behaviors & Features

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