Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion

Exploitation

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

CVSS

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

EPSS

• CVE-2026-87998: 0.49% estimated exploitation activity in the next 30 days; percentile 41.89 (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.

Summary External knowledge connections are created and owned by administrators, and are shared by every external knowledge base bound to them. Deleting an external knowledge base also removed that connection from the instance configuration, with no check on the caller's role and no check for other knowledge bases still using it. Any authenticated user holding a write grant on a single external knowledge base could therefore wipe a shared connection that other knowledge bases depend on, and the dedicated administrator route for deleting a connection explicitly refuses that same operation while the connection is still in use. Preconditions The deployment uses external knowledge bases, backed by the qdrant, milvus or pgvector external providers. Instances with only local knowledge bases are not affected. An administrator created at least one external connection and at least one external knowledge base bound to it. Both of those actions are admin-only. The attacker is an ordinary…

Published by the source

10 Sep 2026, 15:09 UTC

Last modified by the source

1 Oct 2026, 17:56 UTC

Source last checked

26 Oct 2026, 13:51 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-2724-6cpj-gf3v

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-2724-6cpj-gf3v

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-2724-6cpj-gf3v

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# Patch Next advisory brief: CVE-2026-87998

Advisory: Open WebUI: Non-admin users can delete admin-owned external knowledge connections via knowledge base deletion
IDs: CVE-2026-87998, GHSA-2724-6cpj-gf3v
Record: https://patchnext.com/advisories/cve-2026-87998 (revision 3, source checked 26 Oct 2026, 13:51 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.11.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected >= 0.10.0, < 0.11.1; fixed in 0.11.1

## 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://github.com/advisories/GHSA-2724-6cpj-gf3v (GitHub-reviewed advisory GHSA-2724-6cpj-gf3v lists affected ranges: PyPI open-webui >=0.10.0 <0.11.1)
- Verified: https://osv.dev/vulnerability/GHSA-2724-6cpj-gf3v (OSV record GHSA-2724-6cpj-gf3v lists affected ranges: PyPI open-webui >=0.10.0 <0.11.1 (fixed))

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