---
id: CVE-2025-67288
title: >-
  An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers
  to execute arbitrary code by uploading a crafted PDF file
summary: >-
  An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers
  to execute arbitrary code by uploading a crafted PDF file. NOTE: this is
  disputed by the Supplier because the responsibility for file validation (as
  shown in …
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-434
vendor: umbraco
product: umbraco_cms
affected:
  - umbraco_cms = 16.3.3
published: '2025-12-22'
updated: '2026-07-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-67288'
references:
  - url: 'https://github.com/vuquyen03/CVE/tree/main/CVE-2025-67288'
    label: cve@mitre.org
tags:
  - nvd
epss: 0.0055
epssPercentile: 0.43591
ingestedAt: '2026-07-08T17:51:52.384Z'
---

## Overview

An arbitrary file upload vulnerability in Umbraco CMS v16.3.3 allows attackers to execute arbitrary code by uploading a crafted PDF file. NOTE: this is disputed by the Supplier because the responsibility for file validation (as shown in the documentation) belongs to the system administrator who is implementing Umbraco CMS in their environment, not to Umbraco CMS itself. The Supplier also states that PDF JavaScript runs in a completely isolated sandbox, not the browser's DOM context, which means that privilege boundaries would not be crossed, a related issue to CVE-2023-49279.

## Affected

- `umbraco_cms = 16.3.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.