Open WebUI: Upload metadata.knowledge_id bypasses the knowledge-base write-access check (read-only users can add files to KB)

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:N/I:L/A:N

EPSS

• CVE-2026-59217: 0.37% estimated exploitation activity in the next 30 days; percentile 31.17 (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.

Open WebUI upload metadata can add files to knowledge bases without write permission Summary Open WebUI's file upload background processing trusts the client-supplied metadata.knowledgeid value and inserts a knowledgefile association before validating that the uploading user has write access to the target knowledge base. A verified user with only read access to a knowledge base can upload an arbitrary file and set metadata={"knowledgeid":"<target knowledge id"}. The normal /api/v1/knowledge/{id}/file/add endpoint correctly requires knowledge-base write access, but the upload auto-link path bypasses that authorization check. The immediate result is unauthorized modification of the target knowledge base's file membership. The attached attacker-controlled file becomes visible through /api/v1/knowledge/{id}/files, and readers/owners of that knowledge base can retrieve the file through the normal file endpoints because file access is derived from KnowledgeFile membership. Affected Version…

Published by the source

24 Jul 2026, 17:02 UTC

Last modified by the source

4 Aug 2026, 14:40 UTC

Source last checked

26 Oct 2026, 13:49 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-7r7x-gjvr-448g

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-7r7x-gjvr-448g

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-59217

Advisory: Open WebUI: Upload `metadata.knowledge_id` bypasses the knowledge-base write-access check (read-only users can add files to KB)
IDs: CVE-2026-59217, GHSA-7r7x-gjvr-448g
Record: https://patchnext.com/advisories/cve-2026-59217 (revision 2, source checked 26 Oct 2026, 13:49 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 0.10.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected < 0.10.0; fixed in 0.10.0

## 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-7r7x-gjvr-448g (OSV record GHSA-7r7x-gjvr-448g lists affected ranges: PyPI open-webui >=0 <0.10.0 (fixed))
- Verified: https://github.com/advisories/GHSA-7r7x-gjvr-448g (GitHub-reviewed advisory GHSA-7r7x-gjvr-448g lists affected ranges: PyPI open-webui >=0 <0.10.0)

Commands are suggestions: review each one before running it.