CVE-2026-59714

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 Vector

References

• https://github.com/open-webui/open-webui/commit/ac3449cac91e62b08a7c28e54fcd044d14dea791
• https://github.com/open-webui/open-webui/pull/26385
• https://github.com/open-webui/open-webui/releases/tag/v0.10.0
• https://github.com/open-webui/open-webui/security/advisories/GHSA-x2ff-v5v8-m75m