{"schemaVersion":3,"id":"CVE-2026-54009","aliases":["GHSA-wch8-mhj5-9frg","PYSEC-2026-2766"],"status":"published","duplicateOf":null,"title":null,"description":"Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, POST /api/chat/completions accepts an image_url.url value that, when it does NOT start with http://, https://, or data:image/, is interpreted as a file id and resolved against the global file table with no ownership check. an authenticated user can therefore set image_url.url to another user's file id, the server reads that file from disk, base64-encodes it, and injects the data URI into the LLM request. the user then prompts the LLM to describe / OCR the file and reads the content back. 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