CVE-2026-44550: Open WebUI's Mass Assignment via Pydantic extra='allow' Allows Creating Folders in Other Users' Accounts

May 8, 2026

FolderForm uses model_config = ConfigDict(extra='allow'), which permits arbitrary fields to pass through Pydantic validation and be included in model_dump(exclude_unset=True). In insert_new_folder, the server-assigned user_id is placed at the start of the dict and then overwritten by the spread of form data:

References

github.com/advisories/GHSA-hr43-rjmr-7wmm
github.com/open-webui/open-webui
github.com/open-webui/open-webui/security/advisories/GHSA-hr43-rjmr-7wmm
nvd.nist.gov/vuln/detail/CVE-2026-44550

Code Behaviors & Features

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