| Component | Open WebUI |
| Severity | high (CVSS 7.1) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L |
| Published (NVD) | 2026-03-27 |
| Last modified | 2026-06-17 |
| Affected versions | open_webui < 0.8.6 |
| Fixed in | 0.8.6 |
| Weakness | CWE-639 |
| CISA KEV | not listed |
NVD description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to version 0.8.6, any authenticated user can overwrite any file's content by ID through the `POST /api/v1/retrieval/process/files/batch` endpoint. The endpoint performs no ownership check, so a regular user with read access to a shared knowledge base can obtain file UUIDs via `GET /api/v1/knowledge/{id}/files` and then overwrite those files, escalating from read to write. The overwritten content is served to the LLM via RAG, meaning the attacker controls what the model tells other users. Version 0.8.6 patches the issue.
What to do
- Upgrade Open WebUI to
0.8.6or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
Read more
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