GHSA-mgr7-5782-6jh9 The Umbraco Heartcore headless client library uses a vulnerable Refit dependency package
A vulnerable Refit dependency in the Umbraco Heartcore client library allows CRLF injection, potentially enabling header smuggling or body content manipulation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-mgr7-5782-6jh9?
GHSA-mgr7-5782-6jh9 is a vulnerability in Umbraco.Headless.Client.Net, published on 13 Jan 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Impact
The Heartcore headless client library depends on Refit to assist in making HTTP requests to Heartcore public APIs. Refit recently published an advisory regarding a CRLF injection vulnerability whereby it is possible for a malicious user to smuggle additional headers or potentially body content into a request.
This shouldn't affect Heartcore client library usage as the vulnerable method - HttpHeaders.TryAddWithoutValidation - is not used. However, since Refit is a transient dependency for applications using this library, then any users making direct use of Refit could be vulnerable.
Patches
The vulnerable version of Refit has been upgraded to a secure version, as of Umbraco.Headless.Client.Net version 1.5.0, available on Nuget.
Workarounds
If calling Refit from your own code, set any necessary HTTP headers without use of HttpHeaders.TryAddWithoutValidation.
References
See the original Refit advisory for further info.
Which versions are affected by GHSA-mgr7-5782-6jh9?
2 open source packages ship an affected version, including Umbraco.Headless.Client.Net.
| Package | Affected | Fixed in |
|---|---|---|
Umbraco.Headless.Client.Net NuGet | All versions | 1.5.0 |
Umbraco.Headless.Client.Net NuGet | All versions | 1.5.0 |
How do I fix GHSA-mgr7-5782-6jh9?
Upgrade Umbraco.Headless.Client.Net to 1.5.0 or later.
Is GHSA-mgr7-5782-6jh9 being exploited?
There is no known exploitation of GHSA-mgr7-5782-6jh9 in the wild and no public exploit code.