Open WebUI's Improper Authorization in Standard Channels Allows Message Updates with Read Permission — CVE-2026-44571

Summary

## Vulnerability Description In standard channels (i.e., channels whose `channel.type` is neither `group` nor `dm`), the endpoint `POST /api/v1/channels/{channel_id}/messages/{message_id}/update` can be accessed with **read permission only**. When `access_control` is set to `None`, the authorization check `has_access(..., type="read")` evaluates to `True`, allowing users who are **not the message owner** to update…

Product

pip: open-webui

What to do

General, cautious steps (verify details in the official source):

• Review exposure and plan remediation based on risk and environment.
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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