Open WebUI: Global Knowledge Base Enumeration via knowledge-bases Meta-Collection

published 2026-05-08 6 mo ago modified 2026-07-13 3 mo ago also GHSA-6c2x-gcp3-gp73 , PYSEC-2026-2707 , EUVD-2026-30620

cvss: 4.3; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

pypi open-webui 0.9.0
openwebui open_webui 0.9.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 5 mo ago (2026-05-18)

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/open-webui/open-webui/security/advisories/GHSA-6c2x-gcp3-gp73 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
OSV	3.1	4.3	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
pypi	open-webui	<0.9.0	0.9.0

Affected products

open-webui open-webui

Classification

Weakness

CWE-863 Incorrect Authorization
CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
CWE-862 Missing Authorization

References

github.com /open-webui/open-webui/security/advisories/GHSA-6c2x-gcp3-gp73
web, exploit, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-44557
advisory
github.com /open-webui/open-webui
package
pypi.org /project/open-webui
package
github.com /advisories/GHSA-6c2x-gcp3-gp73
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary