Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user can permanently delete files owned by other users via DELETE /api/v1/files/{id} when the target file is referenced in any shared chat. The has_access_to_file() authorization gate unconditionally grants access through its shared-chat branch. It checks neither the requesting user's identity nor the type of operation being performed. File UUIDs (which would otherwise be impractical to guess) are disclosed to any user with read access to a knowledge base via GET /api/v1/knowledge/{id}/files. This vulnerability is fixed in 0.9.0.
Metrics
Affected Vendors & Products
References
History
Tue, 19 May 2026 03:15:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Openwebui
Openwebui open Webui |
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| CPEs | cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Openwebui
Openwebui open Webui |
Fri, 15 May 2026 22:15:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Fri, 15 May 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
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| First Time appeared |
Open-webui
Open-webui open-webui |
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| Vendors & Products |
Open-webui
Open-webui open-webui |
Fri, 15 May 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, any authenticated user can permanently delete files owned by other users via DELETE /api/v1/files/{id} when the target file is referenced in any shared chat. The has_access_to_file() authorization gate unconditionally grants access through its shared-chat branch. It checks neither the requesting user's identity nor the type of operation being performed. File UUIDs (which would otherwise be impractical to guess) are disclosed to any user with read access to a knowledge base via GET /api/v1/knowledge/{id}/files. This vulnerability is fixed in 0.9.0. | |
| Title | Open WebUI: shared-chat branch ignores access_type, allowing unauthorized file deletion | |
| Weaknesses | CWE-639 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-15T19:13:42.052Z
Updated: 2026-05-19T03:55:43.822Z
Reserved: 2026-05-12T21:59:25.666Z
Link: CVE-2026-45671
Updated: 2026-05-15T21:10:57.170Z
Status : Analyzed
Published: 2026-05-15T20:16:49.090
Modified: 2026-05-19T03:08:53.137
Link: CVE-2026-45671
No data.