CVE-2026-87016: Openwebui Open Webui

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

Open WebUI is an extensible, feature-rich, and user-friendly self-hosted AI platform. From 0.6.41 until 0.11.1, get_user_by_oauth_sub and get_user_by_scim_external_id in backend/open_webui/models/users.py used JSON contains matching that compiled to SQL LIKE substring matching on SQLite. An OAuth subject containing percent or underscore wildcard characters could resolve to a different stored identity, potentially selecting an administrator account and issuing the attacker that account's session; PostgreSQL deployments were not affected. This issue is fixed in version 0.11.1.

Affected products

• Openwebui Open Webui: from 0.6.41, before 0.11.1 (fixed in 0.11.1)

Published 2026-09-09. Last modified 2026-09-15.