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Vulnerabilities CVE-2026-59714

CVE-2026-59714

High
Open
TLP:CLEAR

Open WebUI: Cross-channel message overwrite via chat completion API (single-model and multimodel message_ids)

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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.

Details

CVSS Score
7.1
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
Confidence
90%
Published
Aug 13, 2026
Last Modified
Aug 13, 2026
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