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

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

4.3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS

• CVE-2026-44557: 0.22% estimated exploitation activity in the next 30 days; percentile 12.71 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Global Knowledge Base Enumeration via knowledge-bases Meta-Collection Affected Component Retrieval collection access validation: - backend/openwebui/routers/retrieval.py (lines 2330-2355, validatecollectionaccess) - backend/openwebui/routers/retrieval.py (query endpoints, e.g. POST /query/doc) Affected Versions Current main branch (commit 6fdd19bf1) and likely all versions with the knowledge base subsystem. Description The validatecollectionaccess 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 finding is the enabler for the KB destruction…

Published by the source

8 May 2026, 19:51 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-6c2x-gcp3-gp73

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-6c2x-gcp3-gp73

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# Patch Next advisory brief: CVE-2026-44557

Advisory: Open WebUI vulnerable to Global Knowledge Base Enumeration via knowledge-bases Meta-Collection
IDs: CVE-2026-44557, GHSA-6c2x-gcp3-gp73
Record: https://patchnext.com/advisories/cve-2026-44557 (revision 2, source checked 26 Oct 2026, 13:41 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 4.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.9.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.8.12; fixed in 0.9.0

## Suggested inspection (read-only)
- `python -m pip show open-webui`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on open-webui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-6c2x-gcp3-gp73 (OSV record GHSA-6c2x-gcp3-gp73 lists affected ranges: PyPI open-webui >=0 <0.9.0 (fixed))
- Verified: https://github.com/advisories/GHSA-6c2x-gcp3-gp73 (GitHub-reviewed advisory GHSA-6c2x-gcp3-gp73 lists affected ranges: PyPI open-webui >=0 <=0.8.12)

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