Vulnerability · Published Jun 23, 2026 · Assigned by GitHub_M

CVE-2026-54019Open WebUI: RAG ACL Bypass in Milvus Multitenancy Mode

Medium 6.5

In plain English

A medium-severity missing authorization in open-webui from open-webui. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	open-webui	0.9.6	GHSA-p5cp-r7rg-qpxc
PyPI	open-webui	0.9.6	PYSEC-2026-2750

Affected products (as reported)

Vendor	Product	Versions
open-webui	open-webui	< 0.9.6

Weakness: CWE-862, CWE-943 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

References

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