Open WebUI: Open WebUI's Insecure Message Access Breaks Authorization
Open WebUI
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- Severity
- High, CVSS 7.1
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
- Record
- CVE-2026-44569
- Affects
- Open WebUI
- Known exploited
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Published
- Record first published by the source
- May 15, 2026
- Source last modified
- August 3, 2026
Description
Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.6.19, there's an IDOR in the channels message management system that allows authenticated users to modify or delete any message within channels they have read access to. The vulnerability exists in the message update and delete endpoints, which implement channel-level authorization but completely lack message ownership validation. While the frontend correctly implements ownership checks (showing edit/delete buttons only for message owners or admins), the backend APIs bypass these protections by only validating channel access permissions without verifying that the requesting user owns the target message. This creates a client-side security control bypass where attackers can directly call the APIs to modify other users' messages. This vulnerability is fixed in 0.6.19.
Description quoted from the NVD record.
Who is affected
Open WebUI is a chat program that organizations run on their own computers to talk with AI assistants, and it can work fully offline. This flaw affects versions before 0.6.19 and is in the channels feature, where people post messages to shared group conversations. Any user who is signed in and can read a channel could change or delete any message in that channel, including messages written by other people. The app shows edit and delete buttons only to a message's author or an admin, but the server behind it never checks who wrote the message. This flaw is rated High.
What to do
- Find out who runs Open WebUI for your organization and which version it uses. Any version before
0.6.19has this flaw. - If you or a staff member installed it and runs it, that person should update Open WebUI to version
0.6.19or later, which fixes this flaw. - If an IT provider or vendor runs Open WebUI for your organization, send them this advisory and ask when the update to
0.6.19will be done. - Until the update is done, keep in mind that a message in a shared channel may have been changed or deleted by someone other than the person who wrote it.
Analysis written from the source record as of August 3, 2026 and reviewed before publishing.