CVE-2026-87012: 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 0.9.0 until 0.11.1, backend/open_webui/models/calendar.py stored the calendar event meta.alert_minutes value without type validation and the shared upcoming-event scheduler compared that value numerically. An authenticated user with the calendar permission could store a non-numeric alert_minutes value that raised an exception and aborted the instance-wide alert pass, suppressing all users' reminders while the event remained in the lookahead window. This issue is fixed in version 0.11.1.

Affected products

• Openwebui Open Webui: from 0.9.0, before 0.11.1 (fixed in 0.11.1)

Published 2026-09-09. Last modified 2026-09-15.