Vulnerability Details CVE-2026-70487
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.8.8 until 0.11.0, inline direct model metadata accepted client-supplied knowledge attachments without filtering them against the caller's read access. Any authenticated user who knew another user's file id could have the builtin knowledge tools return indexed chunks from that file, causing a read-only cross-user confidentiality loss while leaving knowledge-base permissions and saved workspace model validation unaffected. This issue is fixed in 0.11.0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 33.4%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-70487
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cpe:2.3:a:openwebui:open_webui:0.10.0
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cpe:2.3:a:openwebui:open_webui:0.10.1
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cpe:2.3:a:openwebui:open_webui:0.10.2
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cpe:2.3:a:openwebui:open_webui:0.8.10
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cpe:2.3:a:openwebui:open_webui:0.8.11
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cpe:2.3:a:openwebui:open_webui:0.8.12
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cpe:2.3:a:openwebui:open_webui:0.8.8
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cpe:2.3:a:openwebui:open_webui:0.8.9
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cpe:2.3:a:openwebui:open_webui:0.9.0
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cpe:2.3:a:openwebui:open_webui:0.9.1
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cpe:2.3:a:openwebui:open_webui:0.9.2
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cpe:2.3:a:openwebui:open_webui:0.9.3
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cpe:2.3:a:openwebui:open_webui:0.9.4
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cpe:2.3:a:openwebui:open_webui:0.9.5
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cpe:2.3:a:openwebui:open_webui:0.9.6