An absolute path traversal vulnerability exists in parisneo/lollms-webui v9.6, specifically in the open_file endpoint of lollms_advanced.py. The sanitize_path function with allow_absolute_path=True allows an attacker to access arbitrary files and directories on a Windows system. This vulnerability can be exploited to read any file and list arbitrary directories on the affected system.
The product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as “/abs/path” that can resolve to a location that is outside of that directory.