CVE-2026-44564

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.0, the ydoc:document:update Socket.IO event handler checks whether the sender is a member of the document's Socket.IO room (line 678) but does not verify that the sender has write permission. Users with read-only access join the document room via ydoc:document:join, which only requires read permission (line 520). Once in the room, the user can emit ydoc:document:update events that modify the in-memory Yjs document state and are broadcast to all other collaborators in real time. This vulnerability is fixed in 0.9.0.

Score

CVSS 3.1 5.4 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-05-15

Last modified

2026-05-15

Weaknesses

CWE-863

Affected products

• Open-webui (Open-webui)
• Open Webui (Openwebui)

References

• https://github.com/open-webui/open-webui/security/advisories/GHSA-vrfh-rj4q-rmhr