Open WebUI's Channel Access Grants Bypass filter_allowed_access_grants

Exploitation

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

CVSS

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

EPSS

• CVE-2026-44558: 0.19% estimated exploitation activity in the next 30 days; percentile 8.77 (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.

Channel Access Grants Bypass filterallowedaccessgrants Affected Component Channel creation and update endpoints: - backend/openwebui/routers/channels.py (lines 291-340, createnewchannel) - backend/openwebui/routers/channels.py (lines 617-638, updatechannelbyid) - backend/openwebui/models/channels.py (lines 825-826, setaccessgrants call without filtering) Affected Versions Current main branch (commit 6fdd19bf1) and likely all versions supporting user-created group channels with access grants. Description All resource routers in Open WebUI (knowledge, models, notes, prompts, tools, skills) call filterallowedaccessgrants() before persisting access grants. This function strips principalid: "" wildcard grants from users who lack the relevant sharing.public permission, and strips individual user grants from users who lack accessgrants.allowusers permission. The channel router does not call filterallowedaccessgrants on either create or update paths. A non-admin user who can create group…

Published by the source

8 May 2026, 19:50 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-7rjh-px4v-5w55

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-7rjh-px4v-5w55

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# Patch Next advisory brief: CVE-2026-44558

Advisory: Open WebUI's Channel Access Grants Bypass filter_allowed_access_grants
IDs: CVE-2026-44558, GHSA-7rjh-px4v-5w55
Record: https://patchnext.com/advisories/cve-2026-44558 (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 5.4)
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-7rjh-px4v-5w55 (OSV record GHSA-7rjh-px4v-5w55 lists affected ranges: PyPI open-webui >=0 <0.9.0 (fixed))
- Verified: https://github.com/advisories/GHSA-7rjh-px4v-5w55 (GitHub-reviewed advisory GHSA-7rjh-px4v-5w55 lists affected ranges: PyPI open-webui >=0 <=0.8.12)

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