Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87012

CVE-2026-87012MEDIUM

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   L   N  U  N  N  L    4.3   .0048   39.5     —

AFFECTED
  Product     Versions              Fixed
  open-webui  >= 0.9.0, < 0.11.1 –  —

TIMELINE
  Sep 8   Reserved by GitHub_M
  Sep 9   Published (CNA: GitHub_M)
  Sep 15  EXPLOIT PUBLISHED — CVE-2026-87012 (open-webui). Public exploit reference added.

CWE-754, CWE-1287 · CNA: GitHub_M · CVSS v3.1 · 4 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 8, 2026	Reserved	Reserved by GitHub_M
September 9, 2026	Published	Published (CNA: GitHub_M)
September 15, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-87012 (open-webui). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
open-webui	open-webui	—	>= 0.9.0, < 0.11.1	—

Weaknesses

CWE-754 · CWE-1287

References (4)

https://github.com/open-webui/open-webui/commit/abc69000b33b4894fbd97fc2c962139cf9a8d784 [Patch]
https://github.com/open-webui/open-webui/pull/28790 [Issue Tracking, Patch]
https://github.com/open-webui/open-webui/releases/tag/v0.11.1 [Release Notes]
https://github.com/open-webui/open-webui/security/advisories/GHSA-v39v-59xw-j98g [Exploit, Vendor Advisory]

Authoritative record: CVE-2026-87012 at cve.org

Vendors: open-webui

Weaknesses: CWE-754 · CWE-1287

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87012 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.