CVE-2026-44557 — Open WebUI: Global Knowledge Base Enumeration via knowledge-bases Meta-Collection

Description (CNA)

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the _validate_collection_access function uses an incomplete allowlist that only enforces ownership checks for collections matching user-memory-* and file-* patterns. All other collection names pass through unchecked — including the system-level knowledge-bases meta-collection, which stores the IDs, names, and descriptions of every knowledge base on the instance. Any authenticated user can query this meta-collection directly via the retrieval query endpoints to obtain a global index of all knowledge bases across all users. This vulnerability is fixed in 0.9.0.

Affected (CNA)

Vendor / product	Versions
open-webui / open-webui	affected < 0.9.0

CWE

CWE-863

References

https://github.com/open-webui/open-webui/security/advisories/GHSA-6c2x-gcp3-gp73

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.