Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User Note Access

Exploitation

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

CVSS

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

EPSS

• CVE-2026-44553: 0.28% estimated exploitation activity in the next 30 days; percentile 20.36 (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.

Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User Note Access Affected Component Socket.IO session state and role-check callsites: - backend/openwebui/socket/main.py (lines 330-351, connect handler — role snapshotted into SESSIONPOOL) - backend/openwebui/socket/main.py (lines 393-398, heartbeat handler — does not refresh role) - backend/openwebui/socket/main.py (line 538, ydoc:document:join — uses cached role for admin check) - backend/openwebui/socket/main.py (line 611, documentsavehandler — uses cached role for admin check) - backend/openwebui/routers/users.py (lines 557-633, role update — does not invalidate SESSIONPOOL) - backend/openwebui/routers/users.py (line 641, user delete — does not invalidate SESSIONPOOL) Affected Versions Current main branch (commit 6fdd19bf1) and likely all versions with the collaborative document (Yjs) Socket.IO handlers. Description When a user connects via Socket.IO, the connect handler authenticates them via JWT and stores…

Published by the source

8 May 2026, 19:43 UTC

Last modified by the source

13 Jul 2026, 16:42 UTC

Source last checked

26 Oct 2026, 13:41 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-45m8-cpm2-3v65

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-45m8-cpm2-3v65

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# Patch Next advisory brief: CVE-2026-44553

Advisory: Open WebUI: Stale Admin Role in Socket.IO Session Pool Enables Post-Demotion Cross-User Note Access
IDs: CVE-2026-44553, GHSA-45m8-cpm2-3v65
Record: https://patchnext.com/advisories/cve-2026-44553 (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: High (CVSS 8.1)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.9.0. 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-45m8-cpm2-3v65 (OSV record GHSA-45m8-cpm2-3v65 lists affected ranges: PyPI open-webui >=0 <0.9.0 (fixed))
- Verified: https://github.com/advisories/GHSA-45m8-cpm2-3v65 (GitHub-reviewed advisory GHSA-45m8-cpm2-3v65 lists affected ranges: PyPI open-webui >=0 <=0.8.12)

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