CVE-2026-54019CWE-862CWE-943

Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode

Medium · published June 23, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
31.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00386 · 31.4th percentile
Weaknesses
CWE-862 · Missing Authorization; CWE-943 · Improper Neutralization of Special Elements in Data Query Logic
Published
2026-06-23T16:41Z
EPSS history
Timeline
  • 23 JUN 16:41Z
    Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode
    cvelistv5