CVE-2026-54019: Open WebUI collection ACL bypass through Milvus multitenancy expression

Summary

Open WebUI versions prior to 0.9.6 can have their collection-level ACL checks bypassed when Milvus multitenancy mode is enabled. The ACL treats unknown non-KB collection names as legacy or ephemeral collections, so a user-controlled collection name becomes a resource_id that is interpolated without escaping into a Milvus expression. The flaw is caused by an incomplete fix for CVE-2026-44560.

Mitigation

Fixed in 0.9.6.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• open-webuiPyPILLM dependency since 2024-05-20

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