CVE-2026-54014

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, a path traversal vulnerability exists in open-webui's cache file serving endpoint that allows any authenticated user to read files from sibling directories outside the intended cache directory, by exploiting an incomplete startswith containment check that lacks a trailing path separator. The root cause is that servecachefile() in openwebui/main.py validates the resolved path with filepath.startswith(os.path.abspath(CACHEDIR)) — without appending os.sep. This allows any path resolving to a sibling directory whose name begins with cache (e.g. cachesibling, cachebackup, cachedmodels) to pass validation. This vulnerability is fixed in 0.9.6.