Description
Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.5 before 0.10.0, any authenticated user can overwrite the content of a message in a channel they do not belong to (including private and DM channels) by sending a chat completion request with a channel:-prefixed chat_id and a target message_id. The channel: path routes pipeline output through _make_channel_emitter, which writes to the Messages table using the caller-supplied message_id without binding it to the channel. This issue is fixed in version 0.10.0.
CVSS 7.1EPSS 0.34099999999999997%Risk 0.73
View source- Published
- 2026-08-13 20:17:23
- Affected versions
- >=0.9.5,<0.10.0
- Type
- Web application
- Last modified
- 2026-08-14 19:17:23
- Vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L