Vulnerability · Published Sep 9, 2026 · Assigned by GitHub_M
CVE-2026-87012Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value
Medium 4.3
In plain English
A medium-severity security flaw in open-webui from open-webui. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| PyPI | open-webui | 0.11.1 | GHSA-v39v-59xw-j98g |
| PyPI | open-webui | 0.11.1 | PYSEC-2026-4126 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-webui | open-webui | >= 0.9.0, < 0.11.1 |
Weakness: CWE-754, CWE-1287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
References
- https://github.com/open-webui/open-webui/security/advisories/GHSA-v39v-59xw-j98g x_refsource_CONFIRM
- https://github.com/open-webui/open-webui/pull/28790 x_refsource_MISC
- https://github.com/open-webui/open-webui/commit/abc69000b33b4894fbd97fc2c962139cf9a8d784 x_refsource_MISC
- https://github.com/open-webui/open-webui/releases/tag/v0.11.1 x_refsource_MISC