CVE-2026-87012

What it is

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.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. Limited direct impact.

Exploit odds

0.5% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-09 21:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-09-15 16:17 UTC Last updatedMost recent change to the record

Details

Published

2026-09-09 21:17 UTC

Last modified

2026-09-15 16:17 UTC

Exploit probability

0.5% · EPSS, next 30 days

Weakness

CWE-754

Record status

Analyzed

Affected

• Openwebui Open Webui < 0.11.1

Attack profile CVSS 3.1 · 4.3

Attack vector

Network

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low