CVE-2026-59714: Open-Webui

High severity, CVSS 7.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Open-Webui Open-Webui: from 0.9.5, before 0.10.0 (fixed in 0.10.0)

Published 2026-08-13. Last modified 2026-09-18.