Open WebUI's Improper Authorization in Standard Channels Allows Message Updates with Read Permission

Exploitation

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

CVSS

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

EPSS

• CVE-2026-44571: 0.28% estimated exploitation activity in the next 30 days; percentile 20.21 (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.

Vulnerability Description In standard channels (i.e., channels whose channel.type is neither group nor dm), the endpoint POST /api/v1/channels/{channelid}/messages/{messageid}/update can be accessed with read permission only. When accesscontrol is set to None, the authorization check hasaccess(..., type="read") evaluates to True, allowing users who are not the message owner to update messages. As a result, unauthorized modification of other users’ messages is possible. --- Attack Prerequisites - The attacker is an authenticated user (role user or higher) - The target channel is a standard channel (i.e., not group or dm) - accesscontrol is None or allows read access - The attacker can obtain the target messageid (e.g., via the channel’s message list) Attack Scenario 1. The attacker (User B) retrieves another user’s messageid from the message list in a standard channel 2. The attacker sends a request to POST /api/v1/channels/{channelid}/messages/{messageid}/update 3. The message…

Published by the source

11 May 2026, 14:05 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-jgj3-r8hr-9pjw

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-jgj3-r8hr-9pjw

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# Patch Next advisory brief: CVE-2026-44571

Advisory: Open WebUI's Improper Authorization in Standard Channels Allows Message Updates with Read Permission
IDs: CVE-2026-44571, GHSA-jgj3-r8hr-9pjw
Record: https://patchnext.com/advisories/cve-2026-44571 (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 6.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: open-webui 0.8.6. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI open-webui: affected <= 0.8.5; fixed in 0.8.6

## 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-jgj3-r8hr-9pjw (OSV record GHSA-jgj3-r8hr-9pjw lists affected ranges: PyPI open-webui >=0 <0.8.6 (fixed))
- Verified: https://github.com/advisories/GHSA-jgj3-r8hr-9pjw (GitHub-reviewed advisory GHSA-jgj3-r8hr-9pjw lists affected ranges: PyPI open-webui >=0 <=0.8.5)

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