CVE-2026-87012

Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value

State: Published
Severity: 4.3 Medium
Published: Sep 9, 2026
Updated: Sep 10, 2026
Reserved: Sep 8, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L	GitHub_M

Weaknesses

CWE-754 Improper Check for Unusual or Exceptional Conditions
CWE-1287 Improper Validation of Specified Type of Input

Affected Products

Product	Versions
open-webuiopen-webui	>= 0.9.0, < 0.11.1Affected

References

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