| Component | Open WebUI |
| Severity | medium (CVSS 4.3) |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| Published (NVD) | 2026-08-04 |
| Last modified | 2026-09-18 |
| Affected versions | open_webui >= 0.9.6, < 0.11.0 |
| Fixed in | 0.11.0 |
| Weakness | CWE-639CWE-863 |
| CISA KEV | not listed |
NVD description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, the sync cleanup endpoint authorized write access to the knowledge base in the URL but then acted on directory and file ids supplied in the request body without checking that those objects belonged to that knowledge base. A user with write access to one knowledge base could delete directories and remove file embeddings from another knowledge base, causing documents to drop out of retrieval results and breaking chat-with-file for targeted documents without disclosing contents. This issue is fixed in 0.11.0.
What to do
- Upgrade Open WebUI to
0.11.0or later. - Do not expose the component's API or UI to the internet without authentication in front of it.
Sources
- NVD: CVE-2026-70488
- https://github.com/open-webui/open-webui/pull/26722
- https://github.com/open-webui/open-webui/security/advisories/GHSA-jxc9-xmc4-gr23
- https://github.com/open-webui/open-webui/commit/707efeaed7992dd9896d5928559458f228b9a539
- https://github.com/open-webui/open-webui/releases/tag/v0.11.0
Read more
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