Vulnerability · Published Aug 13, 2026 · Assigned by GitHub_M
CVE-2026-59714Open WebUI: Cross-channel message overwrite via chat completion API (single-model and multimodel message_ids)
High 7.1
In plain English
A high-severity missing authorization in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | open-webui | 0.10.0 | GHSA-x2ff-v5v8-m75m |
| PyPI | open-webui | 0.10.0 | PYSEC-2026-3605 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | >= 0.9.5, < 0.10.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-x2ff-v5v8-m75m x_refsource_CONFIRM
- https://github.com/open-webui/open-webui/pull/26385 x_refsource_MISC
- https://github.com/open-webui/open-webui/commit/ac3449cac91e62b08a7c28e54fcd044d14dea791 x_refsource_MISC
- https://github.com/open-webui/open-webui/releases/tag/v0.10.0 x_refsource_MISC