CVE-2026-54019

Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode

State: Published
Severity: 6.5 Medium
Published: Jun 23, 2026
Updated: Jun 23, 2026
Reserved: Jun 11, 2026

Description

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.6, Open WebUI added collection-level ACL checks, but the patch can still be bypassed when Milvus multitenancy mode is enabled. The ACL allows unknown non-KB collection names as legacy/ephemeral collections. In Milvus multitenancy mode, that user-controlled collection name becomes a resource_id and is interpolated into a Milvus expression without escaping. This is caused by an incomplete fix for CVE-2026-44560 This vulnerability is fixed in 0.9.6.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	GitHub_M

Weaknesses

CWE-862 Missing Authorization
CWE-943 Improper Neutralization of Special Elements in Data Query Logic

Affected Products

Product	Versions
open-webuiopen-webui	< 0.9.6Affected

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-p5cp-r7rg-qpxc

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