CVE-2026-24687 Umbraco.Forms has path traversal and file enumeration vulnerability in Linux/Mac
Authenticated backoffice users can traverse paths and read arbitrary files on Linux/Mac Umbraco installations via the export endpoint.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-24687?
CVE-2026-24687 is a medium-severity path traversal vulnerability in Umbraco.Forms.Issues, published on 29 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Umbraco Forms is a form builder that integrates with the Umbraco content management system. It's possible for an authenticated backoffice-user to enumerate and traverse paths/files on the systems filesystem and read their contents, on Mac/Linux Umbraco installations using Forms. As Umbraco Cloud runs in a Windows environment, Cloud users aren't affected. This issue affects versions 16 and 17 of Umbraco Forms and is patched in 16.4.1 and 17.1.1. If upgrading is not immediately possible, users can mitigate this vulnerability by configuring a WAF or reverse proxy to block requests containing path traversal sequences (`../`, `..\`) in the `fileName` parameter of the export endpoint, restricting network access to the Umbraco backoffice to trusted IP ranges, and/or blocking the `/umbraco/forms/api/v1/export` endpoint entirely if the export feature is not required. However, upgrading to the patched version is strongly recommended.
Weakness: CWE-22
Which versions are affected by CVE-2026-24687?
4 open source packages ship an affected version, including Umbraco.Forms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.Forms NuGet | From 16.0.0 | 16.4.1 |
Umbraco.Forms NuGet | From 16.0.0 | 16.4.1 |
Umbraco.Forms NuGet | From 17.0.0 | 17.1.1 |
Umbraco.Forms NuGet | From 17.0.0 | 17.1.1 |
Products include Umbraco Umbraco Forms.
How do I fix CVE-2026-24687?
Upgrade Umbraco.Forms to a fixed version for your release line: 16.4.1 or 17.1.1.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-24687 being exploited?
There is no known exploitation of CVE-2026-24687 in the wild and no public exploit code.
Other vulnerabilities in Umbraco.Forms.Issues
- CVE-2021-33224 File upload in n/a
- CVE-2025-68924 UmbracoForms Vulnerable to Remote Code Execution via Untrusted WSDL Compilation in Dynamic SOAP Client Generation
- CVE-2025-23041 Short and Long Answer Fields Are Not Validated Server-Side For Maximum Length in Umbraco.Forms
- CVE-2020-7685 Insecure Defaults
- CVE-2024-35239 Stored Cross-site Scripting on Components of Umbraco Forms
Sources
Also known as GHSA-hm5p-82g6-m3xh.