The issue is related to a path traversal bug compounded by an improper access control bug in Argo CD, allowing a malicious user with read-only repository access to leak sensitive files from Argo CD's repo-server. A malicious Argo CD user who has been granted `get` access for a repository containing a Helm chart can craft an API request to the "/api/v1/repositories/{repo url}/appdetails" endpoint to leak the contents of out-of-bounds files from the repo-server. The malicious payload would reference an out-of-bounds file, and the contents of that file would be returned as part of the response. Sensitive files which could be leaked include files from other Applications' source repositories or any secrets which have been mounted as files on the repo-server.