GHSA-6q65-j4jw-9cg8 DotVVM allows path traversal when deployed in Debug mode
Attackers can read arbitrary files from the server if DotVVM is deployed in Debug mode with file resources, exposing secrets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-6q65-j4jw-9cg8?
GHSA-6q65-j4jw-9cg8 is a path traversal vulnerability in DotVVM, published on 19 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Description
There is a path traversal vulnerability in any DotVVM application started in Debug mode, if at least one resource with the FileResourceLocation has been added. The vulnerability allows an attacker to read arbitrary files from the filesystem accessible by the web application (i.e. appsettings.json or other files containing secrets).
Patches
The bug is patched in versions 4.2.10, 4.3.8 and 5.0.0-preview03-final (and newer).
Apart from updating DotVVM, it is also recommend invalidating any secrets which could have been leaked by an application deployed in Debug mode (such as database passwords).
Workarounds
If you cannot update to a patched version, avoid running a publicly accessible DotVVM application in Debug mode (Development environment in Asp.Net Core). It is recommend adding the following statement to the DotvvmStartup class:
config.Debug = false; // TODO: workaround for GHSA-6q65-j4jw-9cg8, remove after updating DotVVM
Which versions are affected by GHSA-6q65-j4jw-9cg8?
6 open source packages ship an affected version, including DotVVM.
| Package | Affected | Fixed in |
|---|---|---|
DotVVM NuGet | All versions | 4.2.10 |
DotVVM NuGet | All versions | 4.2.10 |
DotVVM NuGet | From 4.3.0-preview01-final | 4.3.8 |
DotVVM NuGet | From 4.3.0-preview01-final | 4.3.8 |
DotVVM NuGet | From 5.0.0-preview01-final | 5.0.0-preview03-final |
DotVVM NuGet | From 5.0.0-preview01-final | 5.0.0-preview03-final |
How do I fix GHSA-6q65-j4jw-9cg8?
Upgrade DotVVM to a fixed version for your release line: 4.2.10, 4.3.8 or 5.0.0-preview03-final.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is GHSA-6q65-j4jw-9cg8 being exploited?
There is no known exploitation of GHSA-6q65-j4jw-9cg8 in the wild and no public exploit code.