CVE-2026-59714

HIGH 7.1

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

CVSS Score

7.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-862
Vendor	open-webui
Product	open-webui
Published	Aug 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Affected Versions

open-webui / open-webui

>= 0.9.5, < 0.10.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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