CVE-2026-70483: Openwebui Open Webui

Medium severity, CVSS 4.3. EPSS: 0.5% chance of exploitation in the next 30 days.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.9.6 until 0.11.0, DELETE /api/v1/chats/{id} cancelled a chat's in-flight tasks before checking whether the caller could delete that chat. Any authenticated user who knew another user's chat id could abort that user's running model response, title generation, or tag generation, even though the delete was refused and no chat data was deleted, modified, or disclosed. This issue is fixed in 0.11.0.

Affected products

• Openwebui Open Webui: from 0.9.6, before 0.11.0 (fixed in 0.11.0)

Published 2026-08-04. Last modified 2026-09-18.