Vulnerability in Open-Webui
CVE-2026-87012
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (40.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Open-Webui — versions >= 0.9.0, < 0.11.1
- Openwebui Open Webui
Weakness classification (CWE)
References
- github.com/open-webui/open-webui/security/advisories/GHSA-v39v-59xw-j98g (Exploit, Vendor Advisory)
- github.com/open-webui/open-webui/pull/28790 (Patch, Issue Tracking)
- github.com/open-webui/open-webui/commit/abc69000b33b4894fbd97fc2c962139cf9a8d784 (Patch)
- github.com/open-webui/open-webui/releases/tag/v0.11.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-87012?
- CVE-2026-87012 is a medium-severity vulnerability in Open-Webui, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 4.3/10. Published 2026-09-09.
- How severe is CVE-2026-87012?
- Medium severity. CVSS v3 base score is 4.3 out of 10.