The parisneo/lollms-webui repository is susceptible to a path traversal vulnerability due to inadequate validation of user-supplied file paths. This flaw allows an unauthenticated attacker to read, write, and in certain configurations execute arbitrary files on the server by exploiting various endpoints. The vulnerability can be exploited even when the service is bound to localhost, through cross-site requests facilitated by malicious HTML/JS pages.
The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.