Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, _validate_collection_access() checks the user-memory-* and file-* collection name prefixes but does not check knowledge base collections, which use raw UUIDs as collection names. Any authenticated user who knows a private knowledge base UUID can read its content through the retrieval query endpoints, even though the knowledge API correctly denies that user access. The same gap affects the retrieval write endpoints (/process/text, /process/file, /process/files/batch, /process/web, /process/youtube), allowing an attacker to inject content into or overwrite another user's knowledge base. This vulnerability is fixed in 0.9.5.

Open WebUI Vulnerable to IDOR: Retrieval API Bypasses Knowledge Base Access Controls

Уязвимость функции _validate_collection_access() веб-интерфейса на базе искуственного интеллекта Open WebUI, позволяющая нарушителю получить несанкционированный доступ к защищаемой информации