Answer in brief
CVE-2026-87012 records a Medium severity (CVSS 4.3) vulnerability in Open WebUI: Any authenticated user can suppress calendar alerts instance-wide via a non-numeric alert value. The current sources do not mark it as known exploited. The current feed maps open-webui/open-webui (generic), open-webui (pip), open-webui (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps open-webui/open-webui (generic), open-webui (pip), open-webui (pypi). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:openwebui:open_webui:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| open-webui/open-webuigeneric | >= 0.9.0, < 0.11.1 | Not reported |
| open-webuipip | >=0.9.0,<0.11.1 | 0.11.1 |
| open-webuipypi | >=0.9.0 <0.11.1 | 0.11.1 |
Published upstream
Sep 9, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 9, 2026
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.
Quoted source text, attributed separately from HOL analysis.