CVE-2026-59714
Open WebUI: Cross-channel message overwrite via chat completion API (single-model and multimodel message_ids)
HIGH 7.1EPSS 0.5%
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
- open-webui
- CVSS v3.1 GITHUB
- 7.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L - EPSS
- 0.48% chance of exploitation in the next 30 days, 40th percentile
- Published
- 2026-08-13
- Updated
- 2026-08-14