GHSA-r67m-m8c7-jp83

### Impact

Authenticated users, regardless of their privileges (_User_ or _Admin_), can trick Cachet and install the instance again, leading to arbitrary code execution on the server.

### Patches

This issue was addressed by improving the middleware `ReadyForUse`, which now performs a stricter validation of the instance name.

### Workarounds

Only allow trusted source IP addresses to access to the administration dashboard.

### References

- https://blog.sonarsource.com/cachet-code-execution-via-laravel-configuration-injection

### For more information

If you have any questions or comments about this advisory, you can contact:
- The original reporters, by sending an email to vulnerability.research [at] sonarsource.com;
- The maintainers, by opening an issue on this repository.