CVE-2025-67288 Umbraco CMS has an arbitrary file upload vulnerability
Attackers may execute arbitrary code via crafted PDF uploads in Umbraco CMS, though the vendor disputes this as an administrator configuration responsibility.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-67288?
CVE-2025-67288 is a critical vulnerability in Umbraco Umbraco Cms, published on 22 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-434
Which versions are affected by CVE-2025-67288?
2 open source packages ship an affected version, including Umbraco.Cms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.Cms NuGet | All versions to 16.3.3 | None |
Umbraco.Cms NuGet | All versions to 16.3.3 | None |
Products include Umbraco Umbraco Cms.
How do I fix CVE-2025-67288?
No fix has been published for CVE-2025-67288 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-67288 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-67288 exists.
Other vulnerabilities in Umbraco Umbraco Cms
Sources
Also known as GHSA-54mj-vcvj-q3v5.